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, secured with mil drawing heavy splined fasteners and properly staked to ensure reliable gas system performance.

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

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