The Colt Trooper MK III in .357 Magnum with 4-inch barrel, Colt redesigned medium-frame duty revolver introduced in 1969 to provide a more economical alternative to the Python for police procurement. Type: Revolver Action: Double-Action Caliber: .357 Magnum Capacity: 6 Year introduced: 1969, USA Weight: 39 oz Overall length: 9.3" Status: Discontinued Intended use: Law Enforcement, Collecting, Target Shooting