BCM® Bolt Carrier Group (MPI) - Auto

MSRP: $214.00
Your Price: $199.00
(You save $15.00 )
(1247 reviews)
SKU:
BCM-BCG-AUTO
Features:
Milspec Carpenter No. 158® steel
BCM® Bolt Carrier Group (MPI) - Auto
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
    Simply Awesome!

    I have to agree with all of the other reviewers of this BCG....It is simply second to none! The fit of the BCG in my Bushmaster A3 upper is superb, perfect alignment, function test ran smooth, now all I have to do is go give it a workout in the A.M. Every part of this product is the best of the best, I was running my OEM Bushmaster BCG with less than perfect staking with no problem, but now with the BCM BCG I can just feel the diffrence..we will see how it goes. Thanks again BCM for making such quality products!

  • 5
    bcm bcg

    this is my first build and the machining on this bcg is exceptional, don't hesitate buy now!!!

  • 5
    Simply the best...

    From here on out these are the only BCGs I will order. The quality is exceptional and the function is flawless. Look no further, this is a must have for any respectable build.

  • 5
    Very High Quality

    Popped this little puppy into my gramps's 6920, flawless.

    Id say it was as good if not better then the colt BCG.

    Thanks

  • 5
    best BCG there is!

    FA carrier, upgraded extractor, all the features you could ever want! best of all no 6-8 month backorder list! thanks to this system i have a 16" midlength upper and now the FA carrier group to complete it within just one month of keeping my eye out. thanks BCM!

  • 5
    Awesome BCG

    Very nice bolt carrier group. Everything is just as it should be. The parts all have a snug fit, especially in critical areas like where the cam pin intersects the bolt.

    There is a BCM logo on the side. I kind of like it, since it was done nicely. Some folks don't. It is purely cosmetic. Just something to be aware of if that sort of thing matters to you.

  • 5
    The best there is!

    BCM makes the best AR components and their BCG is no exception! All of the testing and manufacturing steps Colt does (MP & HP testing, shot peening, correct key staking, black extractor insert and o-ring). Better maching and quality than LMT and CMT!!!

  • 5
    Excellent Performance

    Smooth and consistent operation in both 10.5" and 16" carbines. Equipped with the (included) O-ring, it extracts well and puts the brass in a neat pile without mangling the rim. Good staking on the carrier key. Solid product.

  • 5
    Awesome

    This BCG rocks, very high quality, no MIM gas key here, and it is staked perfectly. This BCG has been flawless so far and dont expect any problems.