Features:Barrel: Chrome Moly Vanadium M4 Feed Ramps 16" Length 1x9 Twist Manganese Phosphated Threaded Muzzle A2 Flash Hider Heavy ProfileChamber: 5.56 x 45mmBolt & Carrier: Phosphated 8620 Steel Carrier Assembly HPT/MPI Tested Carpenter 158 Bolt Heat Treated and Plated Mil-Spec Chrome Lined Carrier Interior Carrier Key - chrome lined attached with Grade 8 Screws Properly Staked & Sealed Gas KeyHandguards: Carbine Length Aluminum Delta Ring Single Heat ShieldUpper Receiver: Forged 7075 T6 Aluminum Flat Top with M4 Feed Ramps w/ T-Marks Hard Coat Anodized Bore's surface is coated with dry film lube over the anodized surface Mil-Spec Ejection Port Cover and Round Forward Assist Right Hand EjectionLower Receiver: Forged 7075 T6 Aluminum Hard Coat Anodized Mil-Spec Semi-Auto Aluminum Mag Catch Button Semi-AutoButtstock: M4 5 Position Mil-Spec Buffer Tube Reinforced Fiber H BufferIncluded: 1 x 30rd Magazine Gun LockWeight: 6.2 lbs. EmptyLength: 35.58" Fully Extended 32.25" Collapsed