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Once this part is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). RAIL PANELS: Daniel Defense Rail Panels Made from Santoprene, Heat Resistant to 300° F.The MK18 RISII features our patented 6-bolt Bolt-Up System and has been rigorously tested prior to fielding by USSOCOM. CHARGING HANDLE: GRIP-N-RIP Charging Handle, Body CNC Machined of 7076-T6 Aluminum, Handles & Latch CNC Machined of 6061-T6 Aluminum, Heavy Duty Stainless Steel Roll Pins, Type III Hard Coat Anodized The MK18 Pistol features the picatinny quad rail Daniel Defense currently provides to USSOCOM and a 10.3 inch Cold Hammer Forged Barrel, the same length commonly used for CQB operations.The Omega Rail is exceptionally lightweight makes it perfect for short. It’s available in 7 and 9 length options and is perfect for AR-15 with a carbine length gas system. HANDGUARD: Daniel Defense RIS II MK18, CNC Machined of 6061-T6 Aluminum, Type III Hard Coat Anodized The Daniel Defense Omega Rail System features four Picatinny rails and a drop-in design and two anti-rotation QD sling swivel slots are integrated into the side rails.BOLT CARRIER GROUP: M16 Profile, Mil-Spec MP Tested, Chrome Lined, Properly Staked Gas Key.MUZZLE DEVICE: Daniel Defense Flash Suppressor, 17-4 PH Stainless Steel, Salt Bath Nitride Finished.GAS SYSTEM: Pinned Low Profile Gas Block CNC Machined of 4140 hardened steel with Mil-Spec Heavy Phosphate Coating, Carbine Length, Direct Impingement.BARREL: Chrome Moly Vanadium Steel, Cold Hammer Forged, 1:7 Twist, 10.3" Government Profile, Chrome Lined, Mil-Spec Heavy Phosphate Coated, and HP/MPI Tested.CNC Machined of 7075-T6 Aluminum, Type III Hard Coat Anodized UPPER RECEIVER: Mil-Spec with Indexing Marks and M4 Feed Ramps.Its independently ambi GRIP-N-RIP Charging Handle accommodates left- and right-handed shooters. The 10.3 inch Cold Hammer Forged barrel is the same length in use for the MK18 upper most commonly used for CQB operations. This rail system features a Bolt-Up System that has been rigorously tested prior to fielding by USSOCOM. It includes the M16 bolt carrier group, charging handle and features the RIS II picatinny quad rail that Daniel Defense provides to USSOCOM. The MK18 AR15 style Complete Upper Receiver Group is unmatched in size, weight, and performance.