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, 14.5" M4 Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested; GAS SYSTEM: Mil-Spec F-Marked Front Sight Base, Carbine Length, Direct Impingement; MUZZLE DEVICE: Surefire SF3P Flash Hider / Suppressor Adapter, Precision Machined from US Mill-Certified Heat-Treated Stainless Steel Bar Stock, Black Ionbond DLC Coating, Pinned and Welded to Barrel; BOLT CARRIER GROUP: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key; SIGHTS: A1.5 Fixed Rear Sight, 6061-T6 Aluminum, Type III Hard Coat Anodized; HANDGUARD: Daniel Defense M4A1 FSP Rail Interface System (RIS) II, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized FDE; Made in the USA