BCM® Bolt Carrier Group (MPI) - Auto

MSRP: $199.00
Your Price: $189.00
(You save $10.00 )
(853 reviews) Write a Review
Maximum Purchase:
5 units
Milspec Carpenter No. 158® steel
Stock Status:
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.

Written by Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE), Chief of the Firearms Technology Branch
...M16 bolt carriers are not designed and intended solely and exclusively for use in converting a weapon into a machinegun and are not any combination of parts from which a machinegun can be assembled. Further, an M16 bolt carrier is not a firearm as defined in the GCA or a machinegun as defined in the NFA. An M16 bolt carrier is simply a machinegun part and as such its domestic sale and possession is unregulated under the Federal firearms laws. It is not unlawful to utilize a M16 machinegun bolt carrier in a semiautomatic AR15 type rifle.
***This product contains chemicals/materials known to the State of California to cause cancer and other reproductive harm. To learn more, visit www.p65warnings.ca.gov.***

853 Reviews

  • 5
    Very Solid BCG

    Posted by Andrew Brock on Jul 7th 2020

    After a ton of research I decided on BCM for build. Very solid. Like the low profile look of Parkerized finish. No issues with cleaning or smoothness. But I'm a clean freak so never really gets gummed up.

  • 5

    Posted by Jason Cathers on Jul 6th 2020

    This is my third bcm bcg .
    Its the only one I will buy , they work every time with out failure or malfunction.

  • 5

    Posted by Nathan on Jul 5th 2020

    Couldn’t be happier with the product

  • 5
    Great BCG

    Posted by Rex on Jul 5th 2020

    Great BC and bolt! Several hundred rounds through and flawless performance. Having owned other carbines, I can tell right off the bat the quality of this BCM BCG. Great product.

  • 5
    BCM BCG's are in all of my go-to AR's

    Posted by Tory from Orlando on Jul 5th 2020

    This is my forth BCM bcg and just like the other three, I have no complaints. The fit and finish was perfect. There are no tooling marks anywhere, the gas key is properly staked and the gas rings fit tight into the carrier. And with BCM's QC, I can sleep at night knowing it's been properly tested.
    My range AR's get the cheapest bcg's I can find but my go-to AR's all have BCM's.

  • 5

    Posted by Francisco Alberto Maravilla Gomez on Jul 2nd 2020

    Simple the best in the market.

  • 5

    Posted by Michael mueller on Jul 1st 2020

    Have to be sure to space out your shots, 3x I had double fire on Saturday Nile trigger pull. Otherwise awesome reliability.

  • 5
    Great quality

    Posted by Salvador Torres Lee on Jun 30th 2020

    Great quality, excellent materials, perfect finish, you can’t go wrong with this bolt carrier

  • 5

    Posted by Dan on Jun 30th 2020

    In use in a BCM 14.5 upper with mid length gas system. Operation is flawless.