This 5-piece trigger pull set is specifically prepped and matched to give a 4.5 lb. trigger pull without any stoning of the sear or hammer. The sear spring may need to be properly tensioned to give you the 4.5 lb. trigger pull in your 1911 pistol. For use in only in 1911 pistols that have the military grip safety. This hammer will not work in 1911 pistols with a beavertail grip safety. The spur hammer is blued to look nice with a parkerized Mil Spec 1911 pistol.