Glock 21

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Glock 21^[1]
A Glock 21 with magazine, .45 ACP ammunition, and size "AA" battery for comparison
Type	Semi-automatic pistol
Place of origin	Austria
Production history
Designer	Gaston Glock
Manufacturer	Glock
Variants	21C
Specifications
Weight	745 g / 26.28 oz
Length	193 mm / 7.59 in
Barrel length	117 mm / 4.60 in
Width	32.5 mm / 1.27 in
Height	139 mm / 5.47 in

Caliber	.45 ACP
Action	Safe action
Feed system	13 round magazine
Sights	Fixed front and rear

The Glock 21 is a pistol manufactured by Glock. It is a large frame Glock based on the Glock 20 and fires the .45 ACP ammunition. It uses a modified Glock 20 frame, .45 ACP barrel, modified slide and magazine but these differences are quite minor and it does look identical to a Glock 20. It is a very popular sports and law enforcement pistol in the United States, because of its reputation for rugged dependability, 13-round magazine capacity, and it being chambered in the popular and effective .45 ACP cartridge.

Because of its large frame size, its grip is too large for many people but is well suited for those with larger hands.

The Glock 21 has undergone 3 major revisions since its introduction and current models are called 3rd generation Glock 21s.

The difference between the Glock 21 and the Glock 21C is that the barrel and slide are compensated on the C model to reduce muzzle climb while shooting the pistol.

Additionally, there are Glock 21 "Mariner" (underwater firing capability) / "Tactical" (Extended/Threaded Barrel) Models available in the Philippines.

Another revision is expected in early 2007 in that Glock has advertised "slimline" Glock 21s intended to compete with the Springfield XD-45 line of pistols. ^{[citation needed]}