This high performance bolt is manufactured from SAE 9310 steel and boasts a dramatically longer lifespan than a mil-spec bolt. This complete bolt assembly is for use in a standard Mil-Spec Carrier and uses a standard firing pin, cam pin, extractor and firing pin retaining pin. This bolt features radiuses in all of the traditional 90 degree corners of the locking lug areas. The radiused corners help strengthen the bolt allowing it to handle high loads over a long life span.