Product Details FeaturesBarrel: Chrome Moly steel phosphate coated barrel. 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 DPMS 10.5″ Lightweight M-Lok rail, low-profile gas block, 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.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 anodize. Finished with a Magpul MOE Grip, SB Tactical SBA3 Pistol Stabilizing Brace, and 6 position 7075 buffer tube. The fire control group is a DPMS Panther Polished Trigger (PPT), single-stage assembly. DetailsBarrel Length: 11.5″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: Low-Profile Gas BlockMuzzle Device: A2 -styleReceiver Material: Forged 7075-T6Receiver Type: M4Handguard Type: DPMS 10.5″ Lightweight M-LokBolt Material: Carpenter 158 SteelBolt Carrier Profile: Full AutoFire Control Group: Panther Polished Trigger (PPT)Grip: Magpul MOE Grip, BlackBuffer Tube: 7075 T6 AluminumAdjustment: 6 PositionPistol Brace: SB Tactical SBA3 Pistol Stabilizing Brace