12 Best Holster for Glock 21 Gen 4 Expert Picks and Buying Guide

Finding a reliable and comfortable holster for your Glock 21 Gen 4 can be challenging. You want something that offers secure retention without compromising quick access or comfort during everyday carry.

The best holster for Glock 21 Gen 4 balances protection, ease of use, and durability. This type of holster is designed for those who prioritize safety and convenience whether at the range or on duty. This review will cover key features such as fit, material quality, and adjustability.

By the end, you’ll have a clearer idea of which holsters perform well and suit your specific needs.

Top Choices for Secure and Comfortable Carry Options for Your Glock 21 Gen 4

Image	Product	Price
Our Top Picks 1	POLE.CRAFT IWB Kydex Holster for Glock 20 21 22	Check Price
Our Top Picks 2	G20 G21 G22 IWB Kydex Holster with Optics Cut	Check Price
Our Top Picks 3	OWB Holster for Glock 21 Gen 1-4 Right Hand	Check Price

1. POLE.CRAFT IWB Kydex Holster for Glock 20 21 22

The POLE.CRAFT IWB Kydex Holster offers a trusted solution for carrying Glock pistols with confidence. Its rugged design combined with precise fit ensures protection without sacrificing comfort. This custom-fit holster is specifically crafted for Glock 20, 21 (Gen 3, 4, 5), and Glock 22 Gen 5 models.

Made from lightweight yet durable .08-inch KYDEX, it is sweat-proof, waterproof, and washable, providing lasting use in various environments. The holster fully covers the handgun body to prevent wear and keeps clothing safe from clip damage. Users benefit from adjustable cant using a Phillips screwdriver, allowing the standard 1.5-inch nylon and fiberglass belt clip to shift from 0 to 15 degrees.

This customization makes draw angles more natural and concealment easier. Retention is also adjustable with a screw, enabling users to set preferred tightness for quick draws or secure holstering. The option to wear it outside the belt adds versatility for different carry styles.

This holster is well-suited for daily concealed carry enthusiasts seeking durability, reliability, and comfort in a minimalistic IWB design. Its lifetime warranty adds assurance. Overall, it delivers a balance of performance, adjustability, and a secure fit, making it a dependable choice for Glock owners who want a holster that adapts to personal preferences and daily use.

Pros

• Custom fit for multiple Glock models
• Adjustable cant from 0 to 15 degrees
• Durable, sweat-proof, and washable KYDEX

Cons

• Right-hand draw only
• No multi-color options
• Requires screwdriver for adjustments

Who Should Buy It?

Ideal for Glock 21 owners seeking a secure, concealed carry with customizable fit. Those wanting durable materials and adjustable retention will appreciate this holster. Perfect for daily use in various environments due to its water and sweat resistance.

Who Should Skip It?

Not suitable for left-handed shooters since it supports only right-hand draw. Those needing a variety of color or style options may want alternatives. Users wanting retention adjustments without tools might consider other holsters.

Key Specifications

Specification	Details
Size Compatibility	Glock 21 / Glock 20 (Gen 3 4 5), Glock 22 Gen 5
Material Type	KYDEX
Carry Style	Inside Waistband (IWB)
Hand Orientation	Right
Retention Mechanism	Adjustable screw retention
Mounting Type	Belt
Closure Type	Clip
Special Features	Adjustable cant, sweat-proof, waterproof, washable
Warranty	Lifetime
Color Options	Black, Right Hand Draw (IWB)
Included Components	1 holster

Offering a secure and adaptable carry experience, the POLE.CRAFT IWB Kydex Holster is perfect for right-handed Glock 21 owners. It meets the needs of users who prioritize durability, comfort, and adjustable retention in both concealed and outside-the-belt carry settings.

Owners often praise the holster’s precise fit and durable construction. Many highlight how adjustable cant improves comfort and concealment. Some note the need for a screwdriver to tweak settings but appreciate the secure retention and overall reliability during daily wear.

This holster suits those wanting a strong, customizable concealed carry for their Glock 21, especially right-handed users. Those requiring left-handed options or tool-free adjustments may want to explore other products. For reliable protection and versatility, this remains a solid choice.

2. G20 G21 G22 IWB Kydex Holster with Optics Cut

A versatile inside waistband holster that balances durability and adaptability, making it a great choice for daily handgun carriers. It is designed specifically for Glock models 20, 21, and 22 and offers an optics cut for red dot compatibility.

Crafted from 0.08-inch thick US Kydex, this holster delivers rugged durability along with a waterproof and lightweight build, ideal for everyday use. The hand-polished edges reduce irritation and add to all-day comfort.

Its adjustable cant angle and retention let users personalize carry preferences. Also, the extended sweat shield protects the firearm and enhances wearing comfort. The holster fits both right and left handed users and is designed for appendix carry.

Its adjustable retention and clip closure improve firearm security and convenient access. Overall, this holster presents an excellent value, offering practical features for Glock owners needing a reliable, comfortable, and versatile holster option.

Pros

• Compatible with multiple Glock models
• Optics cut for red dot sights
• Adjustable cant and retention

Cons

• Not compatible with lasers or lights
• Limited to appendix carry style
• Only right-hand orientation available

Who Should Buy It?

Ideal for Glock 20, 21, or 22 owners who carry appendix inside the waistband. Perfect for users wanting an adjustable holster that supports optics and offers durable Kydex construction for daily wear.

Who Should Skip It?

Should be avoided by users who require compatibility with lasers or tactical lights, or those preferring other carry positions. Left-handed shooters will need to find a different option.

Key Specifications

Specification	Details
Size Compatibility	Glock 20 / Glock 21 (Gen 3, 4, 5) & Glock 22 Gen 5
Material Type	Kydex
Carry Style	Inside Waistband (Appendix)
Hand Orientation	Right
Retention Mechanism	Adjustable retention with Phillips screwdriver
Mounting Type	Clip
Closure Type	Clip
Special Features	Optics cut, adjustable cant, hand-polished edges, protective sweat shield
Color Options	Black
Included Components	Kydex holster

This holster suits Glock 21 and similar model owners who want a dependable, adjustable inside waistband carry with optics support. It excels for users valuing durability, comfort, and customization for everyday carry situations.

Users commend the sturdy Kydex build and the comfort from polished edges and sweat shield. The optics cut is appreciated by those with red dot sights. Some mention the restriction to right-handed use and incompatibility with lasers as drawbacks.

For right-handed Glock 21, 20, or 22 carriers seeking a versatile IWB holster with optics support and adjustable features, this is a solid pick. Those needing left-hand options or laser/light compatibility should explore alternatives.

3. OWB Holster for Glock 21 Gen 1-4 Right Hand

Offering strong retention and durability, this OWB holster suits Glock 21 Gen 1-4 users who want a secure yet accessible carry option. It automatically locks the gun in place with a satisfying click and releases smoothly by pressing a button.

Crafted from military-grade polymer, the holster is lightweight, easy to clean, and built to last. The open bottom supports longer barrels and allows debris to fall through, adding convenience and safety.

The paddle mount rotates 360 degrees, fitting belts up to 2 inches wide with ease. Its simple internal design makes reholstering quick and intuitive.

This holster combines security with comfort for daily concealed carry or professional use. It is compatible with Glock 21 models except those with polymer80 frames and Picatinny rails, which limits options for some users.

The black finish is versatile, fitting various uniforms or casual wear. Those who value a balance of reliability and ease of use will find this holster an excellent choice for law enforcement, military, or civilian carry needs.

While it requires some adjustment due to its rigid materials, it performs consistently under different conditions and supports various carry positions thanks to its adjustable cant. Overall, it delivers premium quality without excess bulk, meeting the demands of tactical and everyday users alike.

Pros

• Level II retention for secure locking
• Lightweight military-grade polymer construction
• 360-degree adjustable paddle mount

Cons

• Not compatible with polymer80 Glock 21 with rail
• Rigid material may feel stiff at first
• Limited color options

Who Should Buy It?

Those seeking a durable, secure holster with quick release will appreciate this product. Ideal for law enforcement, military personnel, and everyday Glock 21 carriers who want a lightweight but strong design that allows multiple carry angles.

Who Should Skip It?

Users who need compatibility with polymer80 Glock 21 models or want softer holster materials might want to consider alternatives. Those preferring more color choices or minimalist designs could look elsewhere.

Key Specifications

Specification	Details
Size Compatibility	Glock 21 Gen 1, 2, 3, 4 and Glock 21 SF
Material Type	Military Grade Polymer Materials
Carry Style	Outside Waistband (OWB)
Hand Orientation	Right Hand
Retention Mechanism	Level II Retention with index finger release
Mounting Type	Paddle Mount with 360-degree rotation
Closure Type	Button Release
Special Features	Open bottom for longer barrel, skidproof stripes, adjustable cant
Included Components	Allen Key
Color Options	Black

This holster excels for right-handed Glock 21 owners who need premium retention and versatility. It is perfect for duty use, concealed carry under jackets, or situations requiring quick weapon access. The robust design suits professionals and serious civilians needing reliability.

Buyers praise its secure locking feature that provides confidence during carry. They find the lightweight material comfortable over long periods. Common critiques relate to initial stiffness and incompatibility with certain Glock 21 variants, but overall users highlight solid construction and ease of weapon draw.

Those wanting a reliable, secure OWB holster for Glock 21 Gen 1-4 with adjustable mounting should consider this model. However, if softer materials or polymer80 frame compatibility are priorities, exploring other options would be advisable.

4. WARRIORLAND OWB Kydex Holster for Glock 19/43X, P365, Hellcat Pro

Designed for safe and comfortable outdoor carry, this holster offers durable protection for your Glock 21 and compatible models. It features a rugged US-made 0.08-inch Kydex construction that resists water, sweat, and daily wear.

The hand-polished edges enhance comfort during extended use, while the protective sweat shield helps prevent irritation. Its adjustable retention system produces an audible ‘click’ to confirm firearm security, providing peace of mind in various environments.

The secure 1.75-inch paddle with a hook keeps the holster firmly attached to your belt, ensuring reliable stability while drawing or moving. Additionally, this holster accommodates wide optics and red dot sights, broadening functionality for custom setups. Lightweight yet tough, it supports daily carry needs without weighing you down.

It fits Glock 21, 20 (Gen 3-5), and Glock 22 Gen 5 models without lasers or lights attached. With its thoughtful design and lifetime warranty backed by 24/7 customer service, it represents a reliable option for outdoor enthusiasts seeking a dependable OWB carry solution.

The holster’s robust build and adjustability make it especially suited for those active in tougher, outdoor conditions who value both comfort and firearm security without sacrificing ease of access.

Pros

• Durable and waterproof 0.08-inch Kydex material
• Comfortable hand-polished edges for all-day wear
• Adjustable retention with audible click confirmation

Cons

• Not compatible with lasers or lights
• Only available for right-hand carry
• Limited color options, only black

Who Should Buy It?

Ideal for outdoor users and those needing a strong, secure holster for Glock 21 or similar models. Perfect for people who prioritize durability and comfort during long wear in various weather conditions.

Who Should Skip It?

Those who require holsters accommodating mounted lasers or tactical lights should look elsewhere. Left-handed shooters and users wanting multiple color choices may also want alternatives.

Key Specifications

Specification	Details
Size Compatibility	Glock 21/20 Gen 3-5 & Glock 22 Gen 5
Material Type	Kydex
Carry Style	Outside Waistband (OWB)
Hand Orientation	Right
Retention Mechanism	Adjustable click audible system with Philips screwdriver
Mounting Type	OWB paddle with hook
Closure Type	Buckle
Special Features	Protective sweat shield, optics cut, hand-polished edges
Warranty	2 Year Manufacturer
Color Options	Black
Included Components	1 x G21 OWB Right-Hand Kydex Paddle Holster

Perfect for outdoor users who need a rugged, secure holster that can withstand elements. The WARRIORLAND OWB Kydex Holster stays firmly in place due to its paddle design and provides excellent comfort for extended daily use during outdoor activities.

Customers often praise its sturdy Kydex build and comfortable edges, highlighting how well it holds the firearm securely. The adjustable retention system is praised for providing a reassuring audible click. Common complaints mention incompatibility with lights or lasers and the restriction to right-hand use only.

This holster suits users seeking a reliable, durable OWB option for Glock 21-style pistols without attachments. If you need laser compatibility, ambidextrous use, or more color choices, exploring other models may be wiser.

5. Blade-Tech Holsters Signature OWB Holster for Glock 20

This holster offers a secure and comfortable way to carry your Glock 20 or 21 outside the waistband. Designed and made in the USA, it provides durable construction and versatility for daily tactical use.

The Blade-Tech Signature OWB Holster precisely fits Glock models 20 and 21 from Gen 3 to Gen 5. It is crafted from heat-resistant, high strength polymer, offering better fitment than Kydex. Carry confidence is enhanced by the adjustable retention screws and a positive lock trigger guard, ensuring the firearm stays secure.

The Tek-Lok mounting system adapts to belts between 1.5 and 2.25 inches, allowing easy attachment and customization. Compatibility extends to optics like RMR and red dot sights, enhancing versatility.

The black polypropylene material balances ruggedness and comfort. Users find the lifetime warranty reassuring, as it reflects the maker’s trust in their product.

This holster is ideal for those favoring OWB tactical carry with need for reliability and adaptability. Overall, it combines firm retention, ease of access, and broad compatibility, making it a worthwhile carry solution for Glock 20 and 21 owners.

Pros

• Superior fit for Glock 20 and 21 Gen 3-5
• Adjustable retention with positive lock trigger guard
• Compatible with most optics and suppressor sights

Cons

• Only available for right-hand orientation
• Polypropylene material may feel rigid to some users
• Limited color options, only black

Who Should Buy It?

This holster suits tactical carriers who prefer OWB style and want a secure, adjustable retention. It appeals to those owning Glock 20 or 21 pistols from Gen 3 to Gen 5 looking for optics compatibility and reliable build quality. Right-handed users benefit most from this design.

Who Should Skip It?

Users who need a left-hand holster should look elsewhere. Concealed carry enthusiasts favoring inside-the-waistband designs might find this less suitable. Also, those seeking softer materials or multiple color choices may want other options.

Key Specifications

Specification	Details
Size Compatibility	Glock 20 / 21 (Gen 3, 4, 5)
Material Type	Polypropylene
Carry Style	Outside Waistband
Hand Orientation	Right
Retention Mechanism	Adjustable retention screws and positive lock trigger guard
Mounting Type	Outside Waistband, Tek-Lok
Closure Type	Positive Lock Trigger Guard
Warranty	Lifetime Warranty
Color Options	Black
Included Components	Tek-Lok belt attachment

Ideal for Glock 20 or 21 owners wanting a durable OWB tactical carry solution, the Blade-Tech Signature OWB Holster offers firm retention and optics compatibility. It excels in everyday use where comfort, reliability, and customization are priorities, especially for right-handed users.

Customers highlight the excellent fit and retention system that keeps the pistol secure during active use. They appreciate the ability to adjust retention and the compatibility with various optics. Common critiques include the rigid feel and limited color options, but overall users are pleased with the holster’s durability and secure carry.

Those seeking a sturdy, adjustable OWB holster for Glock 20 or 21 (Gen 3-5) will find Blade-Tech’s Signature an excellent choice. Left-handed users or those preferring concealed carry might consider alternative holsters better suited to their needs.

6. G21 Gun Holster for Glock 21 and Glock 20 Models

Offering reliable functionality and secure retention, this holster is tailored for Glock 21 and Glock 20 models. Its adjustable paddle mount and quick-release button make it ideal for side carry with rapid access. Built from durable polymer, it comfortably fits Glock 21 Gen 1 through 4 and Glock 20 Gen 1 through 4, providing consistent performance.

The 360-degree adjustable carrying angle allows users to personalize their draw position using the included Allen key. Designed for right-handed users, the auto-locking mechanism ensures the firearm remains firmly in place yet quickly releasable with the index finger.

The paddle design supports attachment to belts up to 2 inches wide, making it suitable for various attire. Its polymer material resists impact, heat, and scratches, ensuring durability through rigorous use. This holster suits tactical training, hunting, law enforcement, and daily carry scenarios.

Lightweight and sturdy, it balances comfort with security, giving confidence in carrying without excess bulk. Overall, the G21 Gun Holster combines versatility and practical features to meet the needs of those carrying Glock 21 or 20 pistols in open carry settings.

Pros

• Secure auto-locking retention
• 360-degree adjustable carry angle
• Durable, lightweight polymer construction

Cons

• Does not fit Glock 21 SF Gen 3 with rail
• Only right-handed orientation available
• Paddle may not suit very thick belts

Who Should Buy It?

Ideal for right-handed Glock 21 and 20 owners who value quick draw and adjustable carry. Suitable for range, tactical, or daily open carry use with paddle mounting.

Who Should Skip It?

Not suitable for those needing left-handed options or carrying Glock 21 SF Gen 3 with rails. Also, users preferring belt loop mounts or those with belts wider than 2 inches should look elsewhere.

Key Specifications

Specification	Details
Size Compatibility	Glock 21 Gen 1 2 3 4; Glock 20 Gen 1 2 3 4
Material Type	Polymer
Carry Style	Outside Waistband Carry
Hand Orientation	Right
Retention Mechanism	Auto-locking with quick-release button
Mounting Type	Paddle
Closure Type	Button
Special Features	360-degree adjustable angle; quick-release trigger finger position; impact and heat resistant polymer
Color Options	Black
Included Components	Allen Key

This OWB paddle holster is perfect for those who carry Glock 21 or 20 pistols openly with a focus on quick access and secure retention. Its adjustable angle and quick-release button make it ideal for tactical or everyday use where speed and comfort matter.

Buyers often commend the holster’s solid retention and smooth, fast draw capabilities. Users appreciate the adjustable carry angle and durable polymer build. Common downsides include incompatibility with certain Glock 21 variants and the limited hand orientation.

Choose this holster if you need a reliable right-handed OWB solution for Glock 21 or 20 models with adjustable angle and secure retention. Those needing left-handed use or compatibility with modified Glock 21 SF models should explore other options.

7. WARRIORLAND Kydex Holster for Sig P365/P320 and G43X/G19

Combining durability with smart design, this holster handles concealment with ease. Its robust Kydex material and adjustable features cater well to users needing secure carry options. The WARRIORLAND Kydex Holster fits Glock 20/21 Gen 3-5 and Glock 22 Gen 5 models, focusing on in-the-waistband concealment.

Crafted from .08 inch thick Kydex, it offers a tough, washable surface that resists wear. The holster features a sweat shield to protect the firearm from moisture during extended wear.

A unique claw attachment presses the pistol grip closer to the body, minimizing printing for discreet carry. Users can adjust both retention and cant between 0 and +20 degrees to suit their preferences. The locking system provides a clear audible click, confirming secure retention.

It also allows for open-bottom carry, accommodating threaded barrels without restriction. The optics-ready design accepts various red dot sights when used with the claw. While the holster excludes compatibility with models equipped with lasers or lights, it excels in its intended fit and carry style.

This holster suits right-handed shooters seeking a sturdy, customizable IWB solution for larger Glock pistols. Its balance of protection, concealment, and adjustability presents strong value for those prioritizing comfort and performance.

Pros

• Durable .08 inch Kydex construction
• Adjustable cant angles up to 20 degrees
• Sweat shield prevents moisture contact

Cons

• Not compatible with lasers or lights
• Right-hand only orientation
• Claw may require extra setup

Who Should Buy It?

Ideal for right-handed Glock 20 or 21 owners wanting secure, comfortable concealment. Also good for users who prefer adjustable retention and cant for customizable carry angles. It suits those who appreciate hearing a tactile click confirming firm holstering.

Who Should Skip It?

Avoid if you need a holster fit for guns equipped with lasers or lights. Left-handed shooters will also want to find a different option. People unwilling to adjust screws or install thread locker may dislike maintenance needs.

Key Specifications

Specification	Details
Size Compatibility	Glock 20/21 Gen 3-5 & Glock 22 Gen 5
Material Type	Kydex
Carry Style	IWB Concealment
Hand Orientation	Right
Retention Mechanism	Retention Screws with audible click
Mounting Type	Belt Clip
Closure Type	Retention Screws
Special Features	Optics ready, claw attachment, adjustable cant and retention, full length sweat shield, open bottom
Warranty	2 Year Manufacturer
Color Options	Black
Included Components	1 x G21 IWB Right-hand Kydex Holster with #04 Claw

Those seeking an inside-the-waistband holster for Glock 20 or 21 models will find this option well suited. It works best in concealment situations requiring strong retention, adjustable carry angles, and minimal printing, especially for right-handed users who want dependable everyday carry performance.

Customers typically praise the robustness of the Kydex material and the secure retention system that makes carrying feel safe. Many appreciate the adjustable cant and the claw’s effectiveness in reducing printing. The most frequently mentioned drawback involves compatibility issues with laser or light attachments and the need to periodically tighten screws to prevent loosening.

This holster is a solid choice for right-handed Glock 21 owners seeking adjustable, secure IWB concealment without lasers or lights. Users outside these requirements should consider other models with broader compatibility or ambidextrous designs to better fit their needs.

8. Blade-Tech Total Eclipse OWB Holster for Glock 20/21

Carrying your Glock 20 or 21 comfortably and securely outside the waistband is made easier with this ambidextrous OWB holster. Its USA-made polymer construction ensures durability and heat resistance, making it reliable for daily carry. The holster features adjustable retention screws and a positive lock trigger guard for a secure fit, providing confidence in firearm safety.

Designed with streamlined OWB loops, it grips your body firmly while remaining concealable under outer garments. Compatible with various optics, it accommodates RMR, red dot sights, and suppressor height sights without modification. This holster is molded precisely for Glock 20 and 21 models across generations 3, 4, and 5, ensuring a snug, custom-like fit.

The polypropylene material withstands wear and tear, adding to its long-term use. The ambidextrous design suits both left- and right-handed shooters. Installation is straightforward thanks to the outside waistband mounting style.

A lifetime warranty underscores the manufacturer’s confidence in its quality. Those who favor outside the waistband carry but require discretion will find it a fitting choice. Its robust build and retention system offer high performance and peace of mind.

Overall, it balances comfort, security, and concealability, making it a worthwhile holster for G20 and G21 owners focused on ambidextrous use and optics compatibility.

Pros

• Ambidextrous design fits left and right handers
• Compatible with various optics and sights
• Adjustable retention offers secure fit

Cons

• Outside waistband style might be bulky for some
• Limited color options usually just black
• Polypropylene material may feel rigid at first

Who Should Buy It?

Ideal for Glock 20 or 21 users wanting a sturdy OWB holster. Great choice for those needing ambidextrous carry and optics compatibility. Perfect if you value durability and secure retention for everyday carry with concealment.

Who Should Skip It?

Not recommended for those preferring inside-the-waistband or minimalist carry. Users seeking diverse color options or softer materials may want other holsters. Also, if you don’t use optics, this might offer features you won’t need.

Key Specifications

Specification	Details
Size Compatibility	Glock 20/21 (Gen 3, 4, 5)
Material Type	Polypropylene
Carry Style	Outside Waistband (OWB)
Hand Orientation	Ambidextrous
Retention Mechanism	Adjustable retention screws with positive lock trigger guard
Mounting Type	Outside waistband
Closure Type	Lock
Warranty	Lifetime Warranty
Color Options	Black
Included Components	1 Holster

This holster suits Glock 20 and 21 owners who want ambidextrous outside waistband carry with optics compatibility. It fits users who prioritize a secure fit and want a reliable polymer construction for everyday concealed carry beneath garments.

Users frequently praise the secure retention and comfortable fit for both left- and right-handed use. Many appreciate its ability to fit with various red dot and suppressor height sights. Common criticism centers on the rigidity of the material during initial use and limited color choices.

Choose this holster if you need a versatile OWB solution with ambidextrous handling and optics support. Those preferring IWB carry or softer materials may want to explore other options that better match their preferences.

9. Blade-Tech Total Eclipse 2.0 Glock 20 Modular Holster

Carrying your Glock 21 just got more versatile with a modular holster designed for both inside and outside the waistband use. This holster lets you easily switch between carry styles using a quick-release system, adapting to your needs quickly and efficiently. Crafted in the USA, it features high-strength, heat-resistant polymer that offers a precise fit and excellent durability.

The adjustable retention system and positive lock trigger guard ensure your firearm stays secure without sacrificing draw speed. Compatible with optics like RMR and suppressor-height sights, this holster enhances functionality for various setups. Ambidextrous design makes it suitable for left- and right-handed shooters, while the tool-less Mod-Lok system allows swapping mods without hassle.

Build quality is solid and premium, with a comfortable fit to carry your Glock 20 or 21 in everyday situations. Its lifetime warranty adds peace of mind, proving confidence in durability. Ideal for users who require a dependable, adaptable holster for daily carry and those who switch between IWB and OWB styles frequently.

Overall, it offers a great balance of functionality, security, and modularity for Glock owners.

Pros

• Modular design for IWB and OWB carry
• Ambidextrous for left or right hand
• Adjustable retention for a secure fit

Cons

• Bulky compared to minimalist holsters
• May require breaking in for comfort
• Limited color options (only black)

Who Should Buy It?

Ideal for Glock 20 or 21 owners who want a versatile holster offering quick adaptability between carry styles. Perfect for everyday carry and those who use optics and need reliable, secure retention.

Who Should Skip It?

Not suited for users seeking a slim, minimalist holster or those who prefer soft material options. Outside of black color limits appeal to users wanting more style choices.

Key Specifications

Specification	Details
Size Compatibility	Glock 20/21 Gen 3-5
Material Type	Polypropylene
Carry Style	Modular IWB/OWB
Hand Orientation	Ambidextrous
Retention Mechanism	Adjustable retention with positive lock trigger guard
Closure Type	Lock
Warranty	Lifetime Warranty
Color Options	Black

This modular holster suits Glock 21 and 20 users seeking flexibility for various carry methods. It’s perfect for switching between inside and outside the waistband with ease. Its compatibility with optics and positive lock retention adds to its appeal for daily users who value adaptability and security in different carry conditions.

Buyers commonly praise the holster’s strong build and modular switching capability. Many appreciate how well it secures the firearm and accommodates optics. Some note it can be a bit bulky and requires some time to break in comfortably, but most agree the secure fit and ambidextrous design are definite advantages.

For anyone needing a secure, versatile holster for Glock 21 or 20 that can adapt quickly between carry styles, this model is a solid choice. Users looking for a sleeker or less bulky option might want to explore other holsters designed for minimalist carry.

10. Kenai Chest Holster for Glock – MAS Grey/Coyote

Carrying a Glock 21 Gen 4 comfortably during outdoor activities can be challenging. The Kenai Chest Holster offers a unique low-profile chest carry solution designed specifically for adventurous users.

Made in the USA, this holster is ideal for hiking, backpacking, hunting, and fishing due to its functional design and ease of wear. The harness is crafted to keep comfort at the forefront for all-day use, avoiding common pressure points.

Strategic placement of buckles ensures they stay clear of pack straps and minimize any rubbing. Its adjustable harness fits most body types and allows the holster to be worn either low or high on the chest, providing flexibility for different users and activities.

Constructed with Kydex and nylon, the holster balances durability with lightweight handling. The included harness and holster offer a complete package for chest carrying needs.

While the fixed right-hand orientation limits left-handed users, the reliable retention and classic style work well for those who want secure, accessible carry during outdoor adventures. The lifetime warranty adds confidence in long-term use, making this holster a practical investment for those seeking low-profile carry options tailored to active lifestyles.

Pros

• Comfortable all-day wear harness
• Adjustable for most body types
• Lifetime warranty included

Cons

• Only right-hand orientation available
• Limited color options
• Bulky harness for some users

Who Should Buy It?

Individuals who enjoy active outdoor pursuits and need a secure, comfortable low-profile holster will appreciate this chest carry option. It suits right-handed Glock 21 Gen 4 owners looking for easy access without pack strap interference.

Who Should Skip It?

Those requiring left-handed carry or seeking a smaller, less noticeable holster should consider other styles. It is not ideal for concealed carry under light clothing due to harness bulk.

Key Specifications

Specification	Details
Size Compatibility	Model – 21 Gen1-4
Material Type	Kydex/Nylon
Carry Style	Low Profile Chest Carry
Hand Orientation	Right
Mounting Type	Harness
Closure Type	None
Warranty	Lifetime
Color Options	MAS Grey/Coyote
Included Components	Holster, Harness

Ideal for outdoor enthusiasts who want hands-free, comfortable access to their Glock 21 Gen 4, the Kenai Chest Holster suits activities like hiking and hunting where pack straps could interfere. Its adjustable harness and secure retention offer reliable performance during active use.

Buyers often praise the comfort of the harness and the clever placement of buckles to avoid rubbing. They appreciate the quality of materials and the secure hold during vigorous activities. Some mention the holster is bulky and that left-handed users cannot use it.

This holster is a solid choice for right-handed users needing comfortable outdoor carry with minimal interference. Those needing a sleeker or left-sided option should explore alternative models that better match their preferences.

11. Safariland 6304 ALS Tactical Leg Holster Black

Offering reliable retention and robust construction, this tactical leg holster is tailored for secure, quick access. Its Automatic Locking System guarantees the firearm stays firmly in place.

Crafted from SafariLaminate material, it provides excellent protection for the Glock 21 and its sights. The holster features a low-ride level and a straightforward, upward draw once the release is deactivated. With adjustable double leg straps and a standard leg shroud, it offers a customizable fit for comfort and stability during movement.

The mounting holes in the leg shroud allow attachment of optional accessories for added versatility. Weighing 1.6 pounds, it balances durability with manageable bulk. Ideal for tactical users or those needing a dependable leg holster, it combines practical design with resilient materials.

The sturdy buckle closure secures the holster in place, and the right-hand orientation suits most shooters. While designed specifically for Glock 20 and 21 models, it adapts well to various operational needs. The holster’s straightforward draw and secure locking system enhance readiness during critical moments.

Overall, it provides solid value for professionals requiring a secure leg carry option.

Pros

• Automatic Locking System secures weapon firmly
• Adjustable double leg straps for custom fit
• Durable SafariLaminate construction protects firearm

Cons

• Relatively heavy at 1.6 pounds
• Only right-hand orientation available
• Bulky compared to some inside-the-waistband options

Who Should Buy It?

Ideal for tactical professionals or enthusiasts needing secure leg carry. Fits Glock 21 owner wanting strong retention, protection, and versatile mounting options while maintaining quick access.

Who Should Skip It?

Casual users or those preferring lightweight, minimal carry might find this holster cumbersome. Left-handed shooters must also look elsewhere due to right-hand design limitation.

Key Specifications

Specification	Details
Size Compatibility	GLOCK 20/21
Material Type	SafariLaminate
Carry Style	Double, Adjustable
Hand Orientation	Right
Retention Mechanism	Automatic Locking System (ALS)
Mounting Type	Leg Shroud with mounting holes
Closure Type	Buckle
Color Options	STX Tactical Black
Included Components	Holster

Those needing a tactical leg holster that offers strong retention and protection will find the Safariland 6304 ALS Tactical Leg Holster a great fit. Its adjustable straps and locking system make it perfect for active duty or training environments where secure carry and quick access are critical.

Users commonly praise the secure retention offered by the Automatic Locking System and the durable SafariLaminate material. Many find the adjustable straps improve comfort during extended wear. The most noted drawback is the holster’s weight and bulk, which can affect mobility for some.

Professionals seeking a rugged, secure leg holster for Glock 21 weapons should consider this model. However, lightweight carry enthusiasts and left-handed shooters might look for alternatives better suited to those needs.

12. OWB Holster BALDR S USA Stealth Black Right-Hand

Designed for carrying the Glock 21 Gen 4 with an Olight BALDR S light attached, this OWB holster stands out with its precision fit and durable construction. It perfectly balances comfort, functionality, and reliability for those preferring outside-the-waistband carry.

Crafted from .080 material thickness, the holster offers a sturdy yet comfortable feel while firmly retaining the firearm. It features compatibility with RMR and MOS slide-mounted optics, allowing users to equip their pistols with various modern sight options. The holster is 100% made in the USA, reflecting strong build quality and attention to detail.

Users will appreciate the smooth draw and good retention, designed to keep the firearm securely in place during daily activities. Its black stealth finish makes it discreet for tactical use or everyday carry.

The holster is designed for right-handed shooters and includes a one-year replacement warranty, adding peace of mind. It is ideal for light-bearing OWB carry and is best suited for Glock 20, 21, and 37 Gen 3 and 4 models.

This holster is a solid choice for anyone wanting a dependable, comfortable, and versatile option that accommodates attachments without compromising on fit or retention.

Pros

• Sturdy .080 material thickness
• Compatible with Olight BALDR S light
• RMR and MOS optic friendly

Cons

• Only right-hand orientation available
• May show internal draw marks
• Limited color options

Who Should Buy It?

Ideal for right-handed Glock 21 owners who use an Olight BALDR S light. It suits those wanting OWB carry with strong retention and optic compatibility. Users needing a durable, American-made holster with comfortable wear will benefit most.

Who Should Skip It?

Not suitable for left-handed shooters or those wanting inside-the-waistband options. Users without an Olight BALDR S light or incompatible firearms should consider other holsters. Limited color variation may deter some buyers.

Key Specifications

Specification	Details
Size Compatibility	Fits Glock 20/21/37 Gen 3 & 4
Material Type	.080 material thickness
Carry Style	Outside the Waistband (OWB)
Hand Orientation	Right
Special Features	Compatible with Olight BALDR S light, RMR & MOS compatible
Warranty	One Year Replacement Warranty
Color Options	Stealth Black

This holster fits right-handed users carrying a Glock 21 Gen 4 with an Olight BALDR S light. It works well in situations needing fast, reliable access and secure retention while supporting slide-mounted optics easily. The holster excels in OWB carry scenarios requiring durability and comfort.

Buyers commend the precise fit and sturdy construction that securely holds the firearm and attached light. They appreciate the holster’s optic compatibility and comfortable OWB carry design. Some note minor internal mold marks, but these do not affect performance or durability.

Right-handed Glock 21 Gen 4 owners using an Olight BALDR S light will find great value here. Those needing left-handed options or different carry styles should explore alternatives. This holster delivers reliable, comfortable OWB carry with optic support for its intended audience.

Best Holster for Glock 21 Gen 4 at a Glance

Top Holsters for Glock 21 Gen 4: Best Picks

Material and build quality

The choice of material greatly influences the durability and comfort of a holster for Glock 21 Gen Common materials include Kydex, leather, and nylon, each offering distinct advantages. Kydex is known for its rigidity and excellent wear resistance, providing reliable retention and quick draw capabilities.

Leather offers a classic look with a soft feel against the skin, often molding to the firearm’s shape over time for a custom fit, though it may require more care to maintain its condition. Nylon stands out for its lightweight and breathable qualities, enhancing comfort during extended wear while also being flexible and resistant to various weather conditions. When selecting a holster, considering how the material will hold up over time and how comfortable it will be during daily use helps in making a choice that balances protection, convenience, and longevity.

Retention and security features

When selecting a holster for the Glock 21 Gen 4, focusing on how the holster secures the firearm is key for both safety and accessibility. Various retention systems such as thumb breaks, friction fit, and adjustable tension play a role in keeping the weapon firmly in place while still allowing for a smooth and quick draw. A thumb break adds an extra layer of security by requiring a deliberate motion to release the firearm, while friction fit relies on snug material contact for steady retention without additional snaps or straps.

Adjustable tension options offer flexibility, letting the user customize how tightly the gun is held, balancing security with ease of access. These mechanisms work together to prevent accidental discharges by holding the firearm securely and reducing unnecessary movement.

It’s also important that the holster accommodates the user’s preferred draw style and daily activities, ensuring the firearm stays safely in place throughout various motions yet can be retrieved swiftly when needed.

Fit and compatibility

Choosing a holster designed specifically for the Glock 21 Gen 4 means paying attention to how well it accommodates this model’s unique frame and features. Many holsters offer adjustable sizing that allows for added accessories such as lights or lasers, making customization straightforward.

A secure fit that holds the firearm firmly without excessive movement enhances both safety and convenience during use. Considering the intended use, whether for everyday carry, range sessions, or tactical applications, will help determine which style and material are most suitable.

Comfort during extended wear, ease of drawing, and secure retention are key factors that contribute to a positive experience with your holster choice.

Carry style and concealment

Choosing the right holster for a Glock 21 Gen 4 involves understanding how you plan to carry and how discreet you want to be. Inside the waistband holsters tuck neatly into your pants, making them an excellent choice for concealment and allowing for a lower profile under clothing.

Outside the waistband options rest on the belt or hip and generally provide easier access and greater comfort, especially during extended use, but they tend to print more visibly under lighter clothing. The overall comfort also depends on factors like material flexibility and clip design, which influence how well the holster adapts to body movement.

When deciding, consider your daily activities and attire, since a holster that feels natural and stays secure while maintaining a discreet appearance will enhance both safety and convenience throughout the day.

Attachment options and versatility

When choosing the best holster for Glock 21 Gen 4, paying attention to attachment options and versatility can greatly enhance your carrying experience. Many holsters come equipped with belt loops, clips, or paddle attachments, allowing you to customize the way you carry your firearm based on comfort and accessibility. This variety lets you switch between carry styles effortlessly, whether you prefer inside-the-waistband or outside-the-waistband options.

This variety lets you switch between carry styles effortlessly, whether you prefer inside-the-waistband or outside-the-waistband options. Some designs offer modular features that make it easy to adjust or upgrade components, adding to the holster’s adaptability for different occasions and preferences.

Price and brand reputation

When choosing a holster for a Glock 21 Gen 4, it helps to review various price points that reflect the features and materials offered. Some models provide excellent craftsmanship and durability without demanding a high investment, making them accessible to those new to firearm accessories. Trusted companies in the firearms industry frequently receive positive feedback from buyers who value comfort, retention, and ease of use.

Trusted companies in the firearms industry frequently receive positive feedback from buyers who value comfort, retention, and ease of use. Customer reviews can reveal how a holster performs during daily activities or in more demanding situations, shedding light on its real-world usability. Additionally, many manufacturers back their products with warranties and accessible customer service, offering peace of mind and support if any issues arise.

These factors combined help balance budget with quality and reliability, guiding those buying their first suitable holster toward a satisfying purchase.

Inside the Waistband vs. Outside the Waistband Holsters

Feature	Inside the Waistband (IWB)	Outside the Waistband (OWB)
Concealment	✓	✗
Comfort	Moderate	✓
Accessibility	Moderate	✓
Retention	✓	✓
Ease of Use	Moderate	✓
Best for	Concealed Carry	Open Carry & Range Use

Inside the Waistband (IWB) holsters tuck inside the waistband, offering better concealment, making them suitable for discreet carry. However, they can be less comfortable for extended wear and may slow quick access slightly. Outside the Waistband (OWB) holsters sit on the outside of the pants, providing easier access and greater comfort, which is why they are preferred for open carry or range sessions.

Both styles secure the Glock 21 Gen 4 reliably, but IWB is better for blending in, while OWB is favored for comfort and speed when concealment is not a priority.

Accessories to Enhance Your Holster Experience

Choosing a holster for your Glock 21 Gen 4 is just the beginning. There are several accessories that can improve comfort and utility.

One helpful add-on is a belt attachment or clip. This secures the holster firmly to your belt, preventing it from shifting during movement. Different clips suit different belt widths, so check for compatibility.

Another useful accessory is a sweat guard. This is a raised piece on the holster that protects your firearm from sweat and skin oils, which can cause corrosion over time. It also adds a barrier to reduce discomfort against your skin.

Holster padding can make a big difference for all-day wear. Some soft holsters have removable padding inserts. This can lessen pressure points and improve comfort during extended use.

Retention devices are also worth considering. These can be thumb breaks, hood straps, or locking systems that keep the Glock secure inside the holster. They add an extra layer of safety by preventing accidental falls or easy removal by others.

Cleaning kits designed for holsters often include mild soaps and brushes that help maintain the material without damage. Regular cleaning prevents dirt buildup and extends the life of your holster.

• Belt clips or loops
• Sweat guards
• Padded inserts
• Retention straps or locks
• Holster cleaning kits

These accessories can boost comfort, safety, and durability. Choosing the right ones depends on your daily needs and how you carry your Glock 21 Gen 4.

FAQ’s

What Are The Top Features To Look For In The Best Holster For A Glock Gen

The best holster for a Glock Gen should offer a secure fit with adjustable retention to ensure firearm stability and quick access. Additionally, it should provide comfort for extended wear, durable materials for longevity, and compatibility with your preferred carry style.

Which Materials Offer The Most Durability And Comfort For Glock Gen 4 Holsters?

Kydex and hybrid materials combining Kydex with leather or neoprene offer the most durability and comfort for Glock Gen 4 holsters. These materials provide a secure fit, resistance to wear, and comfort during extended use.

What Are The Best Concealed Carry Holsters Available For The Glock Gen

The best concealed carry holsters for the Glock Gen include the Alien Gear Cloak Tuck 3.5 and the Tulster Profile, both offering a secure fit and comfortable all-day wear. Additionally, the Tier 1 Concealed Axis Elite is highly praised for its adjustable retention and slim design.

How Does An Iwb Holster Compare To An Owb Holster For The Glock Gen

An IWB (Inside the Waistband) holster for the Glock Gen offers better concealment and is more comfortable for everyday carry by sitting inside the pants. In contrast, an OWB (Outside the Waistband) holster provides easier access and generally better retention but is less discreet.

Are There Any Custom Holster Options Specifically Designed For The Glock Gen 4?

Yes, there are custom holster options specifically designed for the Glock Gen 4, offering tailored fit and enhanced functionality. These holsters cater to various carry styles, including inside the waistband, outside the waistband, and shoulder holsters.

Final Verdict

Choosing the best holster for glock 21 gen 4 depends on your specific needs and preferences. The POLE.CRAFT IWB Kydex Holster stands out as a reliable choice for general everyday carry, offering a solid balance of comfort and accessibility. For those seeking affordability without sacrificing quality, the G20 G21 G22 IWB Kydex Holster with Optics Cut delivers great value while accommodating optics.

If you prefer an outside-the-waistband tactical style, the Blade-Tech Holsters Signature OWB Holster provides durability and quick access, ideal for serious carry situations. Meanwhile, the Kenai Chest Holster caters to users who want a low-profile option suitable for outdoor activities and chest carry configurations. Each holster addresses different carry methods and preferences, making it easier to find a match based on how and where you plan to carry your firearm.

• Best Overall: POLE.CRAFT IWB Kydex Holster for Glock 20 21 22
• Best Value: G20 G21 G22 IWB Kydex Holster with Optics Cut
• Best Premium: Blade-Tech Holsters Signature OWB Holster for Glock 20
• Best for Outdoor Use: Kenai Chest Holster for Glock – MAS Grey/Coyote

Select the holster that best fits your carry style and usage, whether it’s IWB comfort, value, tactical OWB, or low-profile outdoor chest carry.