Lower Receiver: Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized; Upper Receiver: Mil-Spec with Indexing Marks and M4 Feed Ramps. CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized; Barrel: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 10.3" Govt Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested; Gas System: Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine Length, Direct Impingement; Muzzle Device: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished; Bolt Carrier Group: M16 Profile, MP Tested, Chrome Lined, Properly Staked Gas Key; Handguard: Daniel Defense RIS II MK18, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized, Black; Daniel Defense Pistol Grip, Glass Filled Polymer with Soft Touch Overmolding; Rail Panels: Daniel Defense Rail Panels made from Santoprene, heat resistant to 300deg F; AR Pistol Receiver Extension; Made in the USA