Remarkable for its accuracy and light recoil, the GLOCK 21 Gen4 delivers the legendary stopping power of the .45 AUTO round with 10/13 round magazine capacity. The Modular Back Strap design on the G21 Gen4 lets you instantly customize its grip to adapt to an individual shooter's hand size. The surface of the frame employs the new scientifically designed, real-world-tested, Gen4 rough textured technology. Internally, the new GLOCK dual recoil spring assembly substantially increases the life of the system. A reversible enlarged magazine catch, changeable in seconds, accommodates left or right-handed operators. The Gen4 system is the perfect complement to this iconic .45 caliber cartridge.

Caliber/System: .45 AUTO / Safe Action
Length: 204 mm / 8.03 in.
Width: 32.50 mm / 1.27 in.
Length Between Sights: 172 mm / 6.77 in.
Height: 139 mm / 5.47 in.
Barrel Height: 32 mm / 1.26 in.
Barrel Length: 117 mm / 4.60 in.
Unloaded: 830 g / 29.30 oz.
Loaded: 1085 g / 38.30 oz.
Trigger Pull: ~2.5 kg / ~5.5 lbs.
Trigger Travel: ~12.5 mm / ~0.49 in.
Barrel Rifling: right hand, octagonal
Length of Twist: 400 mm / 15.75 in.
Magazine Capacity: STANDARD: 13 OPTIONAL: 10