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, 18" S2W Profile, 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, Rifle Length, Direct Impingement; Muzzle Device: Daniel Defense Muzzle Climb Mitigator, Gen II, 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, Type III Hard Coat Anodized; Pistol Grip/Buttstock: Glass Filled Polymer with Soft Touch Overmolding; Receiver Extension: 6-Position Mil-Spec 7075-T6 Aluminum; Sights: Sold Separately; Made in the USA