US Patent 9057573 Pistol hammer

A pistol hammer has a pistol cam formed around a hammer pin axis and configured to accommodate a strut. A pistol rear portion is immediately adjacent to the pistol cam. A pistol spur is immediately adjacent to the pistol rear portion. A pistol head is immediately adjacent to the pistol spur. The pistol head has a flat face that terminates at a flat face point. A concave front face is immediately adjacent to the pistol head extending in a smooth arc from the flat face point through an offset point to a termination point immediately adjacent to the pistol cam. The concave front face is configured to make contact toward a center of the firing pin retainer with a moment arm configured to fire the pistol with minimal force.