Phosphate-coated Chrome Moly steel barrel. 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 standard handguard, an F-Marked front sight base, and an A2 flash hider. These forged lowers are made from 7075-T6 aluminum and are marked "MULTI" for caliber. The finish is hardcoat anodize. The mil-spec diameter 7075-T6 buffer tube is hardcoat anodized, has 6 adjustment positions, and is fitted with a DPMS M4 Carbine Stock. The fire control group is a DPMS mil-spec, single-stage assembly.