Forged 80 lower receivers are created from 7075-T6 aluminum that is certainly heated and hammered into a mould, right before staying permitted to interesting and finished through CNC machining. All mil-spec lower receivers are cast. Billet 80% lowers start off their lives as sound blocks of aluminum which can be https://andreswbflo.wikisona.com/314177/80_lowers_fundamentals_explained