Barrel: Chambered in 300AAC Blackout with a 1:8 twist rate, M4 barrel extension, and a pistol gas system this barrel features a phosphate finish for accuracy and durability. It is finished off with a DPMS 6.5" Quad Rail, .750" diameter low profile gas block, and an A2 flash hider. Upper: Forged 7075-T6 A3 AR upper is made to MIL-SPECS and hard coat anodized black for durability. These uppers are made for us right here in the USA by a mil-spec manufacturer. Bolt: Bolt is made of Mil-spec shot-peened Carpenter 158 steel. Gas key is secured with grade 8 fasteners and staked per mil-spec. Bolt carrier is parkerized outside, and chrome lined inside. Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked "MULTI" for caliber. This lower is completed with a DPMS overmolded A1 style grip, nickel boron polished trigger and fitted with a DPMS CAR style pistol brace.