BRT M4A1 Bolt Carrier Group C158 HPT/MPI Auto

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Product Details
Full auto bolt carrier for the AR Family of Weapons (AR15, M16, M4)

100% made in USA to current USGI M4A1 specifications.

The USGI full auto bolt carrier is Manganese Phosphate coated outside and Hard Chrome lined inside.

The Mil-Spec gas key is chrome lined and secured with properly staked Grade 8 fasteners to ensure reliable gas system performance.

Carpenter 158 bolt is shot peened, HP tested and MP inspected.

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