Chrome Moly steel. Chambered in 5.56 NATO with a 1/7 twist, M4 barrel extension, and a carbine-length gas system. The barrel is finished with a classic handguard, F-Marked gas sight base, and A2 flash hider. These forged lowers are made from 7075-T6 aluminum and are marked ,MULTI, for caliber. The finish is hard coat anodized. Finished with a DPMS CAR Style Blade Brace and a 6-position mil-spec buffer tube. The fire control group is a DPMS single-stage mil-spec assembly.