Single action revolver with 7 inch barrel. Action works! Spin the cylinders, cock the hammer and pull the trigger. Complete with wood grips. M1873 Cavalry Pistol - Antique Gray Length: 12.5 inches, Weight: 2 lbs The Colt Single Action Army revolver, aka Colt Peacemaker or Single Action Army model, is a single action revolver safely holding 5 rounds with an empty chamber under the hammer. It was designed for the US cavalry by Colt's Manufacturing Company and adopted in 1873. It was one of the most famous pistols of the old west, having a similar fame as the Walker Colt and the Colt 1851 Navy.