The Ruger Service-Six is a usa-made double-action revolver chambered in .357 Magnum, introduced in 1972. Primary use: self_defense, law_enforcement. Type: Revolver Action: Double-Action Caliber: .357 Magnum Capacity: 6 Year introduced: 1972, USA Weight: 40 oz Overall length: 9.5" Status: Discontinued Intended use: self_defense, law_enforcement