Aero Precision's M5 .308 Stripped Lower Receiver helps you build a big-bore AR from the ground up. Mil-spec dimensions and coating ensure the highest quality and correct component interface. It features a upper and Nylon tipped tension screws, rear takedown pin detent hole that is threaded for a 4-40 set screw, bolt catch that is threaded for a screw pin (no roll pin needed), and a integrated trigger guard. This stripped lower receiver works with standard DPMS 308 components and magazines.