US Patent 7930968 Cam pin with roller for bolt carrier

A bolt used in a self loading firearm employing a bolt carrier which in turn carries the bolt. The bolt includes a cam pin receptacle and a cam pin carried by the bolt. The cam pin includes a body having a received end and an exposed end. The received end is received in the cam pin receptacle with the exposed end extending outwardly from a surface of the bolt. A roller is rotatably coupled to the exposed end and rotatable around an axis of the body.