Finish: Black Hardcoat Anodize - Caliber: 5.56 Nato - Barrel: Diamondback Barrels 5.56 16 Medium 4150 CrMov Black Nitride 1:8 RH - Gas System: Carbine-Length - BCG: Shot-Peened Magnetic Particle Inspected Mil Spec 8620 Carrier - Upper: A3 Flattop Forged 7075 T-6 Aluminum T-Marked - Lower: 7075 T-6 Aluminum (DB-15 Carbon Lower) - Handguard: 10 Free Float Quad Rail - Grip: A2 Style Black Polymer - Stock/Brace: 6-Position ATI Mil-Spec Buttstock - Magazine: Metal Mag 30 Round - Sights: N/A - Muzzle Device: A2 Flash Hider (1/2 x 28) - Trigger: Mil-Spec - Weight: 6.4 lbs - Overall Length: (Stock Collapsed 32 3/4) (Stock Expanded 36)