The Glock 21 brings the classic .45 ACP cartridge to Glock’s simple polymer frame design.
It offers high capacity for a .45 and has long been popular with shooters who prefer larger, slower bullets.
Quick Specs
- Caliber: .45 ACP
- Size: Full size
- Standard magazine: 13 rounds
- Barrel length: about 4.61 inches
Current Status
In late 2025 Glock replaced earlier generations of this model with the G21 V MOS, part of its new V Series. Earlier generations remain supported with parts and service.
Safety First
Treat every firearm as loaded, keep it pointed in a safe direction and keep your finger off the trigger until you are ready to shoot. Buy only from a federally licensed dealer, take a certified safety course and check current state and local laws before buying, carrying or transporting any handgun.