BRT M4A1 Bolt Carrier Group C158 HPT/MPI Auto

Name: BRT M4A1 Bolt Carrier Group C158 HPT/MPI Auto
SKU: BCG-M4A1
Price: 169.0 USD
Availability: InStock
Rating: 5.0 (1 reviews)

5.0

1 review

SKU BCG-M4A1

$169.00

17 available

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Gary O.

Phenix City,

United States

Mar 7, 2026

smooth as butter

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BRT M4A1 Bolt Carrier Group C158 HPT/MPI Auto

Product Details

Full Auto Bolt Carrier Group BCG for the AR Family of Weapons (AR15, M16, M4)

Carpenter 158 bolt is Shot Peened, HP tested and MP inspected.

Extractor is Phosphate coated with GOLD extractor spring assembly.

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

The Mil-Spec gas key is chrome lined, secured with mil drawing heavy splined fasteners and properly staked to ensure reliable gas system performance.

Bolt is marked "MP". Carrier is marked "BRT" with Logo on the ejection port side.

100% made in USA to current USGI M4A1 specifications.