This rifle has a 16" mid contour barrel with 1x8 twist Mil-Spec M4 stock CAR handguards with single heat shields A2 flash hider and a dual aperture rear sight. The rifle also comes with 1 x 30rd and a CA approved gun lock.Features: Barrel: Chrome Moly Vanadium Medium Contour Profile M4 Feed Ramps 16" Length 1x8 Twist Carbine Gas System Manganese Phosphated Phosphated under F-marked Front Sight Base Threaded Muzzle A2 Flash Hider Chamber: 5.56 X 45 mm Nato Bolt and 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 Key Handguards: Carbine Length Aluminum Delta Ring Single Heat Shield Upper Receiver: Forged 7075 T6 Aluminum A3 Upper with M4 Feed Ramps 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 Ejection DTI Dual Aperture Rear Sight Lower Receiver: Forged 7075 T6 Aluminum Hard Coat Anodized Mil-Spec Aluminum Triggerguard & Mag Catch Button Semi-Auto Buttstock: M4 - 5 Position Mil-Spec Reinforced Fiber H-Buffer Weight: 6.85 lbs Empty Length: 36.375" Fully Extended 32.625 Collapsed Accessories: 1 x 30rd Magazine Gun Lock Chamber Tool