U.S. Arms Nickel Boron M16 Full Auto Rated Bolt Carrier Group
Our U.S. Arms Bolt Carrier Group (BCG) comes fully assembled and ready to drop into most mil spec M16, M4 or AR15 upper receivers. All critical parts are coated with EXO Nickel Boron technology that provides permanent dry lubricity, extreme durability and increases both wear and corrosion resistance. The nickel boron helps friction and improve the overall performance of your rifle.
Carpenter 158 Steel
- Carrier has forward assist serrations
- Shrouded firing pin
- Nickel Boron Coating inside and out
- Forged Mil-Spec gas key attached with Grade 8 hardware and Properly staked.
- 5.56 Bolt is shot Peened and MPI