American Built Arms AR-15 Mil-Spec+ Bolt Carrier Group Nickel Boron Bolt and Cam Pin ABABCGNBB

American Built Arms
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This high quality bolt carrier group meets or exceeds all Mil-Spec specifications. It's a perfect choice for your next quality build or to upgrade an existing rifle.

Specifications and Features:
Carpenter 158 steel bolt
Bolt heat treated, shot peened and MPI tested
Nickel boron coated bolt
E4140 steel extracter, heat treated, shot peened, phosphate coated
4130 steel bolt key, chrome lined, phosphate coated, staked gas key screws
8620 steel carrier, chrome lined, phosphate coated
4140 steel cam pin, nickel boron coated
S7 firing pin with chromed firing pin retainer