The Ruger GP100 is a double-action revolver designed specifically to handle sustained high-volume .357 Magnum fire with triple-locking cylinder and full-length ejector shroud. Its robust construction makes it one of the strongest production revolvers available, favored by agencies and individuals who fire large quantities of full-power .357 Magnum ammunition. Type: Revolver Action: Double-Action Caliber: .357 Magnum Capacity: 6 Year introduced: 1986, USA Weight: 40 oz Overall length: 9.5" Status: Active Intended use: Law Enforcement, Civilian Defense