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The Glock 17 is a 9 mm short recoil–operated, locked-breech semi-automatic pistol that uses a modified Browning cam-lock system adapted from the Hi-Power pistol.[52] The firearm’s locking mechanism uses a linkless, vertically tilting barrel with a rectangular breech that locks into the ejection port cut-out in the slide. During the recoil stroke, the barrel moves rearward initially locked together with the slide about 3 mm (0.12 in) until the bullet leaves the barrel and chamber pressure drops to a safe level. A ramped lug extension at the base of the barrel then interacts with a tapered locking block integrated into the frame, forcing the barrel down and unlocking it from the slide. This camming action terminates the barrel’s movement while the slide continues back under recoil, extracting and ejecting the spent cartridge casing. The slide’s uninterrupted rearward movement and counter-recoil cycle are characteristic of the Browning system.[53] Buy glock online