Our Mac11 Upper receivers are made from laser cut blanks precision bent on CNC press brakes to ensure precise shape and size. Coupled with our machined trunnions and 5.4" barrels they form the perfect upper receiver of unmatched quality. These receivers are UNCOATED and shipped with a oil film to protect them in shipping. Barrel threads are 1/2-28.
This product is only the upper receiver, it does not include a bolt or charging handle. Complete upper receiver kits can be found HERE