Glock 21: The .45 ACP Powerhouse for Duty, Defense, and Sport

The Glock 21 is a high-capacity .45 ACP pistol that combines Glock’s signature reliability with the stopping power of the .45 Auto cartridge. Whether you’re looking for a Glock 21 Gen4, the latest Glock 21 Gen5 MOS, or exploring accessories like threaded barrels, extended magazines, and holsters, this guide will help you unlock the full potential of this iconic firearm.

Shop the Glock 21 for sale, holsters, magazines, and upgrades at glock4u.com.

Key Features of the Glock 21 Gen4 and Gen5 MOS

Both generations offer incredible reliability, but the Glock 21 Gen5 MOS stands out with its optic-ready slide, Marksman Barrel (GMB), and ambidextrous controls.

Design and Ergonomics

1. Gen5 Finger Groove-Free Grip

The Glock 21 Gen5 MOS eliminates finger grooves, allowing a more natural and customizable grip for shooters of all hand sizes.

2. Ambidextrous Slide Stop Lever

Ideal for both left- and right-handed users, this feature makes the Glock 21 Gen5 MOS accessible to all shooters.

3. Flared Mag-Well

A flared mag-well makes reloads faster and easier, particularly in high-pressure scenarios such as competitions or duty use.

4. MOS Optics Compatibility

The Modular Optic System (MOS) on the Gen5 allows for seamless mounting of popular red dot optics, such as:

• Trijicon RMR
• Holosun HS507C
• Leupold DeltaPoint Pro

This feature enhances precision and target acquisition, making it ideal for competitive and defensive applications.

Performance and Versatility

The Glock 21 delivers .45 ACP firepower with smooth, reliable operation in any setting:

• Marksman Barrel (GMB): The Gen5’s enhanced rifling ensures tighter shot groupings and increased accuracy.
• Durability: The nDLC finish on the Gen5 resists wear and corrosion, ensuring long-lasting reliability.
• Recoil Management: Glock’s polymer frame absorbs recoil, making the powerful .45 ACP cartridge manageable for follow-up shots.
• Capacity: With a standard capacity of 13+1 rounds (or optional extended magazines), the Glock 21 is well-suited for duty, self-defense, and the range.

Top Accessories and Upgrades for Glock 21

1. Glock 21 Threaded Barrel

Adding a threaded barrel expands the versatility of your Glock 21, allowing for:

• Suppressor Compatibility: Reduce noise and muzzle flash for tactical or recreational shooting.
• Compensators: Minimize muzzle rise and recoil for faster follow-up shots.

Recommended Threaded Barrels:

• Lone Wolf Match Grade Threaded Barrel
• ZEV Technologies Match Threaded Barrel

2. Glock 21 Extended Magazines and Mag Extensions

Boost your magazine capacity with these options:

• Glock OEM Extended Magazine (15+1 or 26+1 rounds): Perfect for extended range sessions or home defense.
• Taran Tactical Innovations Base Pads: Add 2-5 rounds to your existing magazines for additional firepower.

3. Glock 21 Holsters

Finding the right holster is essential for secure carry and quick access.

Best Glock 21 Holsters:

• IWB (Inside Waistband):
  • Alien Gear Cloak Tuck 3.5: Ideal for concealed carry.
• OWB (Outside Waistband):
  • Safariland 578 GLS Pro-Fit: Durable and adjustable for open carry.
• Chest Holster:
  • Kenai Chest Holster: Perfect for hunting or outdoor activities.

4. Glock 21 Red Dot Sights

Upgrade your Glock 21 Gen5 MOS with a red dot optic for fast, accurate shooting.

Top Choices:

• Trijicon RMR Type 2: Known for its rugged design and clear reticle.
• Holosun HS507C: Solar-powered with shake-awake technology.
• Leupold DeltaPoint Pro: Offers a wide field of view for competitive shooting.

5. Glock 21 Triggers

Enhance your trigger pull for smoother operation and increased precision.

Top Triggers for Glock 21:

• ZEV Technologies Fulcrum Trigger Kit: Fully adjustable for pre-travel and over-travel.
• Apex Tactical Action Enhancement Kit: Delivers a lighter, crisper pull.

6. Glock 21 Sights

Upgrade your iron sights for better performance in any lighting condition.

Best Glock 21 Sights:

• Trijicon HD XR Night Sights: Perfect for low-light and tactical applications.
• Ameriglo Bold Sights: Budget-friendly and highly visible.

Glock 21 Pricing and Availability

All models come with two 13-round magazines and a durable carrying case. Shop for the Glock 21 for sale at glock4u.com.

Glock 21 Review: Why Shooters Love It

Pros

• .45 ACP Power: Delivers excellent stopping power for defense or duty use.
• High Capacity: 13+1 rounds in a lightweight, polymer frame.
• Reliability: Glock’s legendary build quality ensures dependable performance in any environment.
• Customizability: Supports threaded barrels, extended magazines, and optics.

Cons

• Recoil: The .45 ACP’s recoil is heavier than 9mm but manageable with practice.
• Size: The full-size frame may be bulky for concealed carry.

Frequently Asked Questions About Glock 21

1. Is the Glock 21 Good for Concealed Carry?

The Glock 21’s full-size frame is better suited for duty or open carry. However, with the right IWB holster, it can be concealed with larger clothing.

2. Can I Add a Red Dot to the Glock 21 Gen5 MOS?

Yes, the MOS (Modular Optic System) allows for the attachment of red dot optics like the Trijicon RMR, Holosun 507C, or Leupold DeltaPoint Pro.

3. What’s the Price of the Glock 21 Gen5 MOS?

The Glock 21 Gen5 MOS typically retails for $699.99, with used models available for less.

4. Does the Glock 21 Take Extended Magazines?

Yes, Glock OEM and aftermarket extended magazines (up to 26+1 rounds) are available for the Glock 21.

Conclusion

The Glock 21 is the perfect choice for shooters who demand .45 ACP power, high capacity, and legendary Glock reliability. Whether you’re upgrading with a threaded barrel, adding a red dot sight, or boosting capacity with an extended magazine, the Glock 21 excels in versatility and performance.

Order your Glock 21 for sale today at glock4u.com and explore the best accessories to take your shooting experience to the next level!