Ruger Blackhawk, Single Action Only, Revolver, 45 Long Colt, 4.6 Barrel, Alloy Steel, Blued Finish, Black Checkered Hard Rubber Grips, Ramp Front and Adjustable Rear Sights, 6 Rounds 00445 The peak of single action-revolver evolution, the New Model Blackhawk has the natural feel of a traditional solid-frame single action with advanced additions, including a patented transfer-bar ignition system with reverse-indexing stop and loading-gate interlock. It also has a reliable coil-spring mechanism, adjustable sights and black-checkered, hard-rubber grips.