Brand New CMMG Mk4 300 Blackout Upper Receiver Group. CMMG now uses +0.002" Head Space gauges which is the new industry standard. Customers trying to use standard gauges will find they do not check correctly. Mk4 Tactical The Mk4 T or Tactical Upper sets itself apart being equipped with the new RKM11 KeyMod free floating hand guard, a lightweight, low profile alternative to quad rails with even greater modularity. Available with a bead blasted matte finish, 416 stainless steel, 16” barrel and A2 compensator. Attach directly to your AR-15 Lower Receiver and you have a new caliber rifle. Includes Charging Handle and M16 BCG.
Ships for $15 directly to you. No Paperwork.