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
    Highest Quality & Craftsmanship

    It does not get better than this. Bravo Company is always 100%. My 2nd BCG from these guys. The level of quality is top notch, as well as the gas key staking. Thank you BCM, for great service and quality.

  • 5
    BCM® Bolt Carrier Group (MPI) - Auto

    Very Happy with the 1st BCG I bought from BCM it works very good as described !I was so happy with it I bought a 2nd 1 but I bought it as a spare I ordered it on Dec. 4th of 2020 I did not receive it till Jan 25th of 2021 I am not to happy about that !! BCM should give customers the option of Having their Purchase shipped with better carriers at customers exspence of course!!!

  • 5

    Excellent BCG. Been enjoying the product. The only problem is trying to obtain one more for my second build.

  • 5

    Finally got my most recent build together in the times our 'Rona. I was not expecting the grease or whatever that protectant was on it when it arrived. Cleaned that stuff off and ran the BCG in two different builds. It ran well in a 18" rifle length 223 wylde carbine and a 16" midlength 5.56 carbine. It was a smooth experience in both. It also cleaned up really nicely afterwards with not much effort.

  • 5
    Best BCG

    The BCM bcg runs when others do not. There is clearly a difference compared to other products that I have used. I now have 2 use cases where this product resolved issues with rifle short stroking. Worth every penny.

  • 5

    Best bolt on the market hands down !

  • 5
    M16 BCG

    Is a great BCG, yes I recommend it’s a great buy

  • 5
    BCM BCG - Another Great Product

    As expected, top quality from BCM. I paired the BCG with a BCM MK2 BFH upper and BCM Ambi Charging Handle and everything just worked smoothly from the first round. The BCG comes well packaged with protective padding and is lubed and ready to go. Need to get another BCM Lower now. Thank you BCM for great products.

  • 5
    BCM bolt carrier group

    I have built a number of guns using Bravo barrels, uppers and other parts. The bolt carrier group is the same quality as any other part made by Bravo. I would recommend them wholeheartedly to any friend working on a build.