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, 16" Lightweight Profile, Mid-length Gas System, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested; Gas System: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel and Mil-Spec Heavy Phosphate Coating, Mid-length, Direct Impingement; Muzzle Device: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished; Bolt Carrier Group: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key; Handguard: Daniel Defense MFR 15.0, CNC Machined of 6061-T6 Aluminum, M-LOK Attachment, Type III Hard Coat Anodized; Grip: Daniel Defense Vertical Grip, Glass-Filled Polymer, M-LOK; Sights: Sold Separately; Made in the USA