BCM® Bolt Carrier Group (MPI) - Auto

MSRP: $214.00
Your Price: $199.00
(You save $15.00 )
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.
Watch the video below to learn more about our quality control for Bolt Carrier Groups:
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.***

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1247 Reviews

  • 5
    Bolt Carrier

    Excellent quality, the holy grail of bc!

  • 5

    A++ as per usual with BCM. Nothing to say other than you can always expect the best with their products. This is no exception!

  • 4
    BCM asks for a review...

    This is the second BCM BCG I’ve purchased and while I love the first one (which has about 4,000 rounds in front of it) I’ve only put about 300 against this one. I’ve had it for a few weeks and to be honest, for hard-use parts like barrels, uppers, and BCGs, these should be WORKED before a review is submitted to influence consumer opinion. I think it’s weird but honestly it’s likely an automated request. With that said, I LOVE my first BCG...BUT... if BCM wants a legit review on this one, please email me. Send a few thousand rounds of quality ammo (no bi-metal, steel cased or reman) and I’ll give this thing a fair shake, document it and send it to BCM. Until then I’ll keep up the low round count and dry fire training in this ammo shortage.

  • 4
    In stock!

    For starters, I couldn't believe they had them in stock and they didn't sell out in 5 minutes... I couldn't find a BCG anywhere. With that being said, they got it shipped and to me fairly quickly, all things considered. The only thing I didn't like is the cost of shipping, but they were sold out locally, and it is what it is. Haven't got to shoot my new build much, but the BCG looks good and I'm sure will work as advertised. It came properly staked and all of that.

  • 5

    Top notch. My go to!

  • 5

    Great Craftsmanship! Fast shipping. Thank you BCM!

  • 5
    Go to BCG

    I run this BCG in every one of my ARs. These are the best BCGs on the market.

  • 5
    bolt carrier

    just like everything i get from bcm...flawless

  • 5

    Not my first BCM product or my last. The quality is top notch and performs great. Definitely recommend!