Battle Arms Development Bad-PCC Billet Upper Receiver Black Anodized. We have made select component changes to accommodate these new dimensions. The majority of these features are the same as our traditional PCC uppers but we have added our patented barrel nut cover and tucked a locking lug behind the charging handle to prevent the bolt from sliding off the rail when changing between SAFE and AK rated ammo. This upper also features a smaller dust cover and ejection port cover to prevent any potential gas blow back issues that you may be having. Specifications for Battle Arms Development Bad-PCC Billet Upper Receiver: Manufacturer: Battle Arms Development Color: Black Finish: Black Anodized Condition: New Features of Battle Arms Development Bad-PCC Billet Upper Receiver BATTLEARMS Dedicated PCC Upper Billet 7075-T6 Black Type III Hard Coat Anodized Finish Package Contents: Battle Arms Development Bad-PCC Billet Upper Receiver Battle Arms Development BAD-PCC-UR: Bad-PCC Billet Upper Receiver Black Anodized