The G31 Gen4 is the full-size .357 SIG Glock, offering near-.357 Magnum velocity from a semi-auto pistol platform. Type: Pistol Action: Semi-Automatic Caliber: .357 SIG Capacity: 15 Year introduced: 2013, Austria Weight: 26.1 oz Overall length: 7.32" Status: Active Intended use: Service, Law Enforcement