AR10 (.308 Caliber) Bolt Carrier Group Nickel Boron 6.5 Grendel Bolt Carrier Group - 9310 Steel Bolt Nitride

- 9310 Steel Bolt Nitride Treated

- S7 Tool Steel Extractor

- 8670 Steel firing pin Hard Chrome Coated

The Nickel Boron coating has a Rockwell hardness between 52-56

- Nitride Treated Gas Key and Extractor

AR10 (.308 Caliber) Bolt Carrier Group Nickel Boron 6.5 Grendel Bolt Carrier Group - 9310 Steel Bolt NitrideThis is our DPMS compatible 308 Bolt Carrier Group Nickel Boron coated. It comes with forward assist side serrations (not shown in photo). It's fully assembled and ready to drop into your 308 Build. Carrier is made with 8620 hardened steel and the bolt is Made from 9310 Vac Arc Premium Carburizing Steel which has a high core hardness and high fatigue strength unlike standard Hot Cold rolled 9310 steels. This is a Mil Spec bolt carrier assembly with