Colt Trooper MK V: updated MK III with improved trigger action and shrouded ejector rod. Final evolution of the Trooper line. Type: Revolver Action: Double-Action Revolver Caliber: .357 Magnum Capacity: 6 Year introduced: 1982, USA Weight: 42 oz Overall length: 9.5" Status: Discontinued Intended use: Duty / Service, Law Enforcement, Target Shooting