The Ruger GP100 with 4-inch barrel is the standard service-length configuration of Ruger's heavy-duty medium-frame revolver. Built to handle a steady diet of full-power .357 Magnum without the accelerated wear that plagued earlier designs, the GP100 uses a triple-locking cylinder and full-length ejector rod shroud. The 4-inch barrel balances portability with velocity and is the most widely issued law enforcement configuration. Type: Revolver Action: Double-Action Caliber: .357 Magnum Capacity: 6 Year introduced: 1986, USA Weight: 41 oz Overall length: 9.5" Status: Active Intended use: law_enforcement, service, competition, self_defense