Product Details FeaturesBarrel: Chrome Moly steel. Chambered in 5.56 NATO, with a 1/7 twist, M4 barrel extension, and a carbine-length gas system. Barrel is finished off with a classic handguard, F-Marked gas sight base, and A2 flash hider. Upper: Forged 7075-T6 A3 AR upper is machined to MIL-SPECS and hard coat anodized. Uppers include forward assist and dust cover. These uppers are made for us right here in the USA by a mil-spec manufacturer. Detachable A2 carry handle is included. Bolt: Full-auto profile bolt carrier group. Shot-peened, mil-spec Carpenter No. 158® steel bolt. Gas Key Hardened to USGI Specifications, Fastened with Grade 8 screws, and Staked Per Mil-Spec. Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked “MULTI” for caliber. Finish is hard coat anodized. Finished with a DPMS CAR Style Blade Brace and 6 position mil-spec buffer tube. The fire control group is a DPMS single-stage mil-spec assembly. DetailsBarrel Length: 10.5″Barrel Profile: A2Barrel Steel: Chrome Moly VanadiumBarrel Finish: PhosphateChrome Lining: NoMuzzle Thread Pattern: 1/2″ x 28Twist Rate: 1 in 7″Barrel Extension: M4Gas System Length: CarbineDiameter at Gas Block: .750″Gas Block Type: F-marked Front Sight BaseMuzzle Device: A2 -styleReceiver Material: Forged 7075-T6Receiver Type: M4Handguard Type: M4 with heat shields, BlackBolt Material: Carpenter 150 SteelBolt Carrier Profile: Full AutoFire Control Group: DPMS FCGGrip: A2Pistol Brace: DPMS Adjustable CAR Style Blade Brace *Detachable A2 carry handle included