Features – Barrel: 7.5 Chambered in 300AAC Blackout with a 1:8 twist rate M4 barrel extension and a pistol length gas system. This phosphate barrel is finished off with a DPMS Quad Rail free-float 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. Finish is hard coat anodize. Finished with an A2 pistol grip DPMS adjustable CAR brace and 6 position 7075 buffer tube. The fire control group is a mil-spec single-stage assembly. – Details – Barrel Length: 7.5 – Barrel Profile: Heavy – Barrel Steel: Chrome Moly Vanadium – Barrel Finish: Phosphate – Chrome Lining: No – Muzzle Thread Pattern: 5/8 x 24 – Twist Rate: 1 in 8 – Barrel Extension: M4 – Gas System Length: Carbine – Diameter at Gas Block: .750 – Gas Block Type: Low-Profile Gas Block – Muzzle Device: A2 -style – Receiver Material: Forged 7075-T6 – Receiver Type: M4 – Handguard Type: DPMS 6.5 Quad Rail – Bolt Material: Carpenter 158 Steel – Bolt Carrier Profile: Full Auto – Fire Control Group: Mil-Spec FCG – Grip: DPMS A2 Grip Black – Buffer Tube: 7075 T6 Aluminum – Adjustment: 6 Position – Pistol Brace: DPMS Adjustable CAR Brace – Magazine: 1 (One) 30 Round DPMS Aluminim Magazine