The Glock 37 Gen4 updates the full-size .45 GAP platform with the dual recoil spring assembly, interchangeable backstraps, and reversible enlarged magazine release of the Gen4 generation, improving the ergonomics of the largest-caliber standard Glock. Type: Semi-Automatic Pistol Action: Striker-Fired Caliber: .45 GAP Capacity: 10 Year introduced: 2012, Austria Weight: 27.7 oz Overall length: 8.15" Status: Discontinued Intended use: law_enforcement, self_defense