Glock 31 Gen3 full-size .357 SIG. Provides bottlenecked .357 SIG ballistics in a standard G17-size frame. Adopted by several federal agencies seeking greater penetration. Type: Pistol Action: Semi-Automatic Caliber: .357 SIG Capacity: 15 Year introduced: 1997, Austria Weight: 26.1 oz Overall length: 7.32" Status: Active Intended use: Service, Duty, Law Enforcement