Aero Precision, M5 Forged Ar308 Lower, Multi-Caliber, Anodized Finish

The Aero Precision M5 Forged Stripped AR308 Lower Receiver in Anodized Black brings the M5 series engineering to builders who want a rugged, true AR-10 platform foundation machined from 7075-T6 forged aluminum and finished with black hardcoat anodizing for durable wear resistance; this stripped lower, weighing about 12 oz and marked "Cal Multi," accepts standard AR-308 components and magazines and works well for precision hunting rigs, match guns, and duty-style builds where reliability matters. The lower features an upper tension screw with a nylon-tipped set screw in the grip tang so you can dial in upper/lower fit to eliminate play, a threaded rear takedown pin detent hole for a 4-40 set screw, and a bolt catch threaded for a screw pin so no roll pin is required during assembly; the integrated trigger guard and selector markings compatible with 45, 60, or 90-degree safeties accommodate different trigger groups and ergonomics, and it accepts Battle Arms Development short-throw safeties while remaining compatible with standard selectors. There's no gap with aftermarket pistol grips, it ships with the upper tension screw, and as an American-made M5 platform receiver this lower is an ideal starting point for builders—don't forget an Aero Precision M5 (.308) Lower Parts Kit to complete the build; FFL transfer is required.