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- 8620 Steel Carrier Engraved with "Made in the USA"
The Nickel Boron coating has a Rockwell hardness between 52-56
- S7 Tool Steel Extractor
SPECS: Fits - AR15 or M16 rifles
- Bolt engraved with MPI/9310
AR10 (.308 Caliber) Bolt Carrier Group Nickel Boron 6.5 Grendel Bolt Carrier Group - 8620 Steel Carrier EngravedThis 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
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