Ruger Single Action Bisley Hammer with half-cock notch, E.D.M. and CNC machined. Finished in complete black oxide. Designed to replace the factory .22/.32 Single Six hammer to allow for a better, lower profile, wide spur. It is best to be used with the Power Custom Ruger Single Action Vaquero/Black Hawk Trigger. The factory trigger may be altered as per detailed instructions. Using the Power Custom Black Hawk trigger, the trigger pull will weigh about 2 1/4lbs with the Wolff reduced power spring kit and approx. 3 to 3 1/4 lbs with the factory springs. Requires minor modification to the transfer bar to allow the gate to be opened when on half cock. The rear of the hammer radius is larger then the BlackHawk/Vaquero Hammers. This fills in the big gap that is at the rear of the hammer at the top of the back strap of the factory Revolver.