The GLOCK 21GEN4 is a full-size .45 ACP pistol built for duty, home defense, and high-volume range use. It delivers the legendary GLOCK reliability in a proven, hard-hitting caliber. Since arriving on our shelves in mid-2024, this model has shown an exceptionally low return rate—customers consistently get the durable, no-nonsense performance they expect from a Gen4 GLOCK.
Key Features
- Gen4 Modular Back Strap System for a customizable grip fit.
- Rough Textured Frame (RTF) for a secure, non-slip grip in all conditions.
- Dual Recoil Spring Assembly reduces felt recoil and extends component life.
- Reversible magazine catch for left- or right-handed operation.
- Rugged Tenifer finish provides superior corrosion resistance and durability.
Specifications
| Caliber | .45 ACP |
| Barrel Length | 4.61″ |
| Overall Length | 8.07″ |
| Height (with magazine) | 5.51″ |
| Width | 1.34″ |
| Weight (measured) | 6.3 oz |
| Magazine Capacity | 13+1 |
| Sights | Fixed, polymer (compatible with many aftermarket options) |
Frequently Asked Questions
Is the GLOCK 21GEN4 compatible with aftermarket sights?
Yes. Our staff has confirmed direct compatibility with popular sight sets from Trijicon and AmeriGlo, among others. The factory sight dovetail accommodates a wide range of upgrades.
What magazines does this model use?
The GLOCK 21GEN4 uses standard GLOCK 21 magazines. It ships with one 13-round magazine, and readily accepts all factory and aftermarket GLOCK 21 magazines.
What is the main difference between Gen4 and previous generations?
The Gen4 series introduces the Modular Back Strap System, a reversible magazine catch, an enlarged magazine release button, and the Rough Textured Frame. The dual recoil spring assembly is also standard on Gen4 .45 ACP models.
✅ Same-day shipping from Rockford, IL
✅ Discreet packaging
✅ 30-day returns
✅ Secure checkout
Reviews
There are no reviews yet.