Military Pay Scale Military Ranks Aircraft / Aviation Vehicles & Artillery Infantry Arms Warships & Submarines

Glock 21

Semi-Automatic Pistol

Infantry / Small Arms

1 / 1
Right side view of the Glock 21 semi-automatic pistol

The Glock 21 was based on the Glock 20 but firing the large American .45 ACP cartridge.

Authored By: Staff Writer | Last Edited: 5/22/2018 | Content ©www.MilitaryFactory.com
The Glock 21 (Glock GmbH of Austria) was essentially the Glock 20 model modified for the US market to fire the .45 ACP. The .45 ACP (or ".45 Auto") cartridge was a rimless cartridge developed by American gunsmith John Browning in 1904. The .45 ACP was featured in the legendary Colt M1911 semi-automatic pistol which became a staple of the US Army in 1911. The large cartridge proved effective enough though at the expense of its low-energy performance. Nevertheless, the Glock 21 existed to feed a market need for a police sidearm and general self-defense weapon.

The Glock 21 featured a larger frame than previous Glock iterations and appeared in production form in 1990. The Glock 20 frame was used as the starting point for the Glock 21, making room for a new magazine to take on the larger round as well as a new slide. The barrel featured an octagonal bore as opposed to the hexagonal types featured in other Glocks. The grip was enlarged to accept the new magazine which made the new Glock 21 comfortable in the grip of "large-handed" individuals. The standard magazine was of 13-rounds, this once again, due to the larger cartridges and these cartridges had to be staggered within the magazine. Like other semi-automatic pistols, the magazine was inserted into the base of the handgrip. Unloaded weight was 26.28 ounces. Length was 7.59 inches with a barrel length of 4.61 inches.

Externally, the Glock 21 looked very much like Glock 20 with the most notable exception being the enlarged grip.


Glock GmbH - Austria
National flag of Greece National flag of United States Greece; United States
- Close Quarters Battle (CQB) / Personal Security
- Sidearm
Overall Length:
193 mm (7.60 in)
Barrel Length:
117 mm (4.61 in)
Weight (Unloaded):
1.62 lb (0.74 kg)
Front; Rear
Recoil / Double - Safe Action
Glock 21 - Base Series Designation

Disclaimer | Privacy Policy | Cookies

2021 Military Pay Scale Army Ranks Navy Ranks Air Force Ranks Alphabet Code DoD Dictionary American War Deaths French Military Victories

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world and WDMMA.org, the World Directory of Modern Military Aircraft.

Facebook Logo YouTube Logo

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-