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- Bolt Engraved with MPI/9310
- Extractor insert with Crane O-Ring Upgrade
Carrier made with 8620 Steel and bolt made from mil-spec Carpenter 158 Steel
It's fully assembled and ready to drop into your 308 Build
AR15/M16 - 5.56/223 C158 Bolt Carrier Group Nitride (Mil-spec bolt) BoltAssembly - Bolt Engraved with MPI/9310Carrier made with 8620 Steel and bolt made from mil spec Carpenter 158 Steel. The nitride coating is the strongest plate available, it's the same protective finish that's used in gun barrels and CNC tool protection. If you're looking for a bolt carrier that's going to hold up against the roughest conditions then this bolt carrier group is the one for you. C158 Bolt (mil spec) Bolt Laser Engraved with "C158 MPI" AR15 and M16 Compatible 5. 56 223 8620
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