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UPC: 812526020994 SKU: BCM-BCG-AUTO Category: Tag: Product ID: 28362


BCM® (MPI) complete bolt carrier group is fully assembled. (BCG)

Bolt carrier group (auto version) for your AR15, M16, or M4. Parkerized exterior and chrome lined inside carrier. Machined to USGI specifications. This M16/M4 carrier includes the proper Mil-Spec gas key. Gas key is chrome lined and heat treated per GI specifications. Gas key is secured to carrier via USGI domestic mfg Grade 8 fasteners and properly staked per Mil-Specs. These properly hardened parts ensure a strong staking and proper gas system functioning.

The bolt assembly is machined from the correct Mil-Spec Carpenter No. 158® steel, shot peened for increased strength, includes tool steel machined extractor and ejector, BCM Extractor Spring, and is HPT (High Pressure Tested) and MPI (Magnetic Particle Inspected).

Prior to shipping, all BCM Bolt Carrier Groups are test fired for function. As such, the Bolt Carrier Group will show handling marks consistent with these quality control procedures.


  • MIL-SPEC Carpenter No. 158 steel bolt
  • High pressure tested and magnetic particle inspected
  • Shot peened for increased strength
  • Chrome lined carrier for durability
  • Chrome lined gas key, hardened to USGI specifications
  • Grade 8 hardened fasteners for secure attachment
  • Gas key properly staked per MIL-SPEC
  • Tool steel extractor for reliable extraction
  • BCM extractor spring for consistent performance
  • Black extractor insert for enhanced functionality
  • MIL-SPEC crane O-ring for improved sealing



  • Bolt FinishManganese Phosphate
  • Bolt MaterialCarpenter 158 Steel
  • BrandBravo Company Manufacturing
  • Caliber Gauge5.56 NATO
  • Carrier FinishManganese Phosphate
  • Carrier Material8620 Carpenter Steel
  • Carrier StyleM16 Bolt Carrier
  • High Pressure TestedHigh Pressure Tested
  • Magnetic Particle InspectMagnetic Particle Inspected
  • Manufacturer.Bravo Company Manufacturing
  • PlatformAR-15
  • Weight11.5 Oz