Barrel: Chrome-moly vanadium steel barrel chambered in 5.56 NATO nitride coated with a 1:7 twist rate M4 barrel extension and a carbine-length gas system. This M4 profile barrel is finished off with a 13.5" DPMS M-Lok free-float handguard low-profile gas block and A2 flash hider.Upper: Forged 7075-T6 M4 AR upper is machined to MIL-SPECS and hard coat anodized. These uppers are made right here in the USA.Bolt Carrier Group: Full-auto profile bolt carrier group. Shot-peened mil-spec Carpenter 158 steel bolt. Gas Key Hardened to USGI Specifications fastened with Grade 8 screws and Staked Per Mil-Spec. Carrier is 8620 steel M-16 full-auto profile.Lower: These forged lowers are quality made using 7075-T6 aluminum and are marked "MULTI" for the caliber. Finish is hard-coat anodized. The Mil-spec diameter 7075-T6 buffer tube is hard-coat anodized with 6 adjustment positions and is fitted with a M4 style stock DPMS A2 grip aluminum trigger guard and a MIL-SPEC FCG. Barrel Length: 16" Barrel Material: 4150V Chrome Moly Vanadium Steel Barrel Finish: Nitride Barrel Profile: M4 Chamber: 5.56 NATO Twist Rate: 1 in 7" Extension: M4 Gas System: Carbine-Length Gas Block Type: Low Profile .750" Diameter Upper Receiver: Forged 7075 T6 Aluminum Receiver Style: M4 with feed ramps Receiver Finish: Hardcoat Anodized Forward Assist: Yes Dust Cover: Yes Handguard Style: DPMS M-Lok Free Float Rail Bolt Steel: Carpenter 158 Mag Phosphate coated Bolt Carrier Steel: 8620 Chrome Lined Staked Gas Key: Yes Lower Receiver: Forged 7075 T6 Aluminum Receiver Finish: Hardcoat Anodized Fire Control Group: AR-15 Mil-Spec Fire Control Group Buffer Tube: 7075 T6 Aluminum Mil-Spec Tube Adjustment: 6-position collapsible Stock: DPMS M4 Carbine Stock Magazine: (1) 30-Round Magazine (where available by law) Weight: 7 Lbs Length: 32"