Our M5 .308 Complete Lower Receiver is the perfect base for your custom AR10 rifle. The enhanced complete lower receiver includes the A2 Grip and does not include a stock. It works with standard AR 308 components and magazines, integrated trigger guard, and the selector markings will work with 45, 60, or 90 degree safety selectors. It has a receiver extension and a .308 carbine buffer and spring. The rear takedown pin detent hole is threaded for a 4-40 set screw.