Mil-Spec with Enhanced Flared Magazine Well and Rear Receiver QD Swivel Attachment Point; Mil-Spec with Indexing Marks and M4 Feed Ramps; Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:11" Twist, 18" S2W Profile, Mid-Length Gas System, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested; Pinned Low Profile Gas Block CNC Machined of 4140 Hardened Steel and Mil-Spec Heavy Phosphate Coating, Mid-length, Direct Impingement; Thread Protector: 12L14 Steel, Salt Bath Nitride Finished; Bolt Carrier Group: M16 Profile, Chrome Lined, Properly Staked Gas Key; H Buffer; Handguard: Daniel Defense MFR 15.0, CNC Machined of 6061-T6 Aluminum, M-LOK Attachment; Receiver Extension: 6-Position Mil-Spec 7075-T6 Aluminum; Buttstock: Daniel Defense Buttstock, Glass Filled Polymer with Soft Touch Overmolding