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
    Bcg

    Awesome bolt carrier group. Runs flawlessly in my SPR build I just completed. I recommend and will purchase BCM products again.

  • 5
    BCM M4 Bolt Carrier

    Worked great, 100 plus rounds and not one issue.

  • 5
    BCM BCG

    Excellent product as expected!

  • 5
    Sweet

    Very top shelf item!

  • 5
    1st time shopper

    Never purchased from this company. Long time shooters and instructors told me bcm is the best and very reliable. Haven't had a chance to cycle it in my ar but excited to see how it runs. Ps, very fast service, delivery and priced well.

  • 5
    Customer review

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  • 5
    Perfect fit and unrivaled quality.

    This is the second BCM bolt carrier group I've purchased. Both assemblies were replacements for semiautomatic originals in Smith & Wesson M&P 15 Sport II Carbines. I verified headspace in each weapon, and it was correct. They are, quite simply, the best.

  • 5
    Customer review

    Review body is empty

  • 5
    BCG

    Got all my parts for new rifle built and I'm very impressed with the quality. I disassembled the BCG and cleaned the parts and lubed them up. I inspected my barrel and was impressed with the quality of the barrel. Earlier in the year I bought a blemished upper. I had to heat the upper in order to insert barrel. This is not a bad thing. This is what I look for in a build. I don't want sloppy fitting arms parts. Everything should be slick or tight. Thank you for quality professional weaponry.