Full-size .357 SIG pistol on the G22-size frame. The .357 SIG cartridge was developed to replicate .357 Magnum revolver ballistics in a semi-automatic. The G31 Gen3 was adopted by the Delaware State Police and several other agencies seeking high-velocity duty performance. Type: Semi-Automatic Pistol Action: Striker-Fired Caliber: .357 SIG Capacity: 15 Year introduced: 1998, Austria Weight: 25.95 oz Overall length: 7.32" Status: Discontinued Intended use: law enforcement, duty, service