These AR-10 / .308 Lower receivers are made for DPMS Style Uppers and are made to fit both the DPMS and SR-25 magazines. The receivers carry some of the highest quality features out there on the market including a teardrop trigger guard machined into the lower, reinforced pivot pin and a beveled magazine well to aid in loading. Like all products we hold them to the tightest tolerances and stand by them for life. The finish is black hardcoat anodized per Mil-Spec and come in a matte black finish. These are now 7075 Aluminum billet Receiver.