The Glock 22 is a pistol manufactured by Glock. It is a Glock 17 modified to fire .40 S&W ammunition. It uses a modified slide, frame, .40 S&W barrel and magazine but is otherwise near identical in looks to the Glock 17. It has a 10, 15, or 17 round magazine capacity.
The Glock 22 has undergone three major revisions since its introduction in 1990 and current models are called 3rd generation Glock 22s. The Glock 22C is a version of the Glock 22 that has a ported barrel and slide to reduce muzzle climb while shooting the pistol.
The Glock 22 is one of the most popular law enforcement pistols in the United States, and compares favorably to other .40 S&W pistols.
Caliber modification One notable feature of the Glock 22, and indeed many modern .40 S&W pistols, is the ability to change the caliber to .357 Sig with a simple barrel swap. This is possible due to the similar operating pressures of both rounds, and the fact that the .357 Sig is based on a .40 S&W case, necked down to accept .355 inch bullets.