AR10 (.308 Caliber) Bolt Carrier Group Nickel Boron 6.5 Grendel Bolt Carrier Group The Nickel Boron coating has

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

- 9310 Steel Bolt Nitride Treated

- Nitride Treated Gas Key and Extractor

- SP-1 Slickside Design (No Forward Assist)

SPECS: Fits - AR15 or M16 rifles

AR10 (.308 Caliber) Bolt Carrier Group Nickel Boron 6.5 Grendel Bolt Carrier Group The Nickel Boron coating hasThis 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