AR-15 Hammer Made by Orignal Colt OEM.  These and parts are made by various military contractors, for example the fire control parts, mag catch, detents, and pins are made by the same contractors that Colt use.  Bolt catches and selectors are made by the same contractor.  Springs are generally made  by the same for most LPK's. They are made to military specs other than the AR dimensions ( not M-16 ) on the fire control parts.  The fire control parts for the AR15 rifle come from the same manufacturer as made for the M-16 rifle.  Everything is first rate parts, not MIM, NEW and made in the U.S.A.