Barrel: Chrome Moly Vanadium M4 Feed Ramps 16″ Length 1:7 Twist A2 Flash Hider Manganese Phosphated Phosphated under Gas Block DTI Low Profile Gas Block Threaded Muzzle Light Weight Profile Chamber: 5.56 X 45 mm Bolt And Carrier: Phosphated 8620 Steel Carrier Assembly Heat Treated and Plated Mil-Spec Chrome Lined Carrier Interior Carrier Key – chrome lined, attached with Grade 8 Screws Properly Staked & Sealed Gas Key Handguards: 15″ MLOK Free Float Upper Receiver: Forged 7075 T6 Aluminum Flat Top With M4 Feed Ramps Hard Coat Anodized Mil-Spec Ejection Port Cover and Round Foward Assist Right Hand EjectionLower Receiver: Forged 7075 T6 Aluminum Hard Coat Anodized Mil-Spec Aluminum Triggerguard Semi-Auto Aluminum Mag Catch Button Buttstock: M4 5 Position Mil-Spec Buffer Tube Weight: 6.2 lbs Empty Length: 36.375″ Fully Extended 32.625 Collapsed Accessories: 1 x 30rd Magazine Gun Lock