DetailsCaliber: 5.56 NATOBarrel Length: 16"Overall Length: 32"Barrel Profile: M4Barrel Steel: Chrome Moly VanadiumBarrel Finish: PhosphateChrome Lining: NoMuzzle Thread Pattern: 1/2" x 28Twist Rate: 1 in 8"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 shieldsBolt Material: Carpenter 158 SteelBolt Carrier Profile: Full AutoFire Control Group: Panther Polished Trigger (PPT)Grip: A2-styleStock: M4-styleBuffer Tube Length: CarbineBuffer Tube Diameter: Mil-specWeight (as configured): 6.8 lbsBackup Sight: Magpul MBUS Rear Sight, BlackFeaturesBarrel: Chrome-moly vanadium steel barrel chambered in 5.56 NATO, with a 1:8 twist rate, M4 barrel extension, and a mid-length gas system. This A2 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 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 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 MOE Carbine Stock, Magpul grip, and Panther Polished Trigger (PPT).