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Glock 21 Specifications

The Glock model 21 is a full size semi-automatic pistol chambered for the powerful .45 ACP cartridge. Glock pistols are in service with military and law enforcement agencies around the globe and are very popular among American shooters for target practice, hunting and personal protection. The Glock 21 gives shooters both a powerful cartridge and a high-capacity magazine.
  1. Design

    • The Glock 21 is designed to shoot only as a double action, meaning that the operation of the slide does not cock the hammer. A full trigger pull is required to both cock and release the hammer for firing. The pistol features a "safe action" system, which is a series of internal safeties that keep the weapon's firing mechanism uncocked until the trigger is intentionally pulled. The advantage of this system is that it prevents the weapon from accidentally discharging if the pistol is dropped.


    • The Glock 21 has a lower receiver, or grip, constructed from a strong polymer. The pistol's magazines are also made of polymer. The advantage of using plastic is that it makes the gun lightweight and impervious to rust or corrosion. The metal parts of the firearm are treated with a patented process that protects the surface.


    • The Glock 21 is a large frame handgun with a length of 7.59 inches, a height of 5.47 inches, and a width of 1.27 inches. The unloaded weight of the pistol is 26.28 ounces and a loaded weight of 38.28 ounces with a full 13-round magazine. The length of the barrel is 4.6 inches and the distance between the front and rear sights is 6.77 inches. The standard magazine capacity is 13 cartridges; however, 10-round magazines are available for locations that prohibit high-capacity magazines.

    Glock 21 "C" Model

    • The Glock 21 is also available as a "C" model. These variants are built with two slots cut into the top of the barrel near the muzzle. There are also slots cut into the top of the slide assembly that align with the slots in the barrel. The slots divert gas to the top of the weapon when the pistol is fired. The pressure created by the gas pushes down on the top of the weapon to compensate for the recoil. This feature helps to keep the pistol on target, even when firing rapidly.

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