BCM® MK2 Receiver Extension

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Our BCM MK2 Receiver Extension for your AR15, M16, M4. Machined from 7075T6 and manufactured to Mil-Spec dimensions and specifications. Mil-Spec receiver extensions have a slightly smaller dimension where the stock slides on.

Hard Coat Anodized per Mil-A-8625F, Type III, Class 2

These tubes should be used with stocks such as USGI, BCMGUNFIGHTER™, Colt, LMT, SOPMOD, VLTOR, Stag Arms, and others that a made to the Mil-Spec size.

*NOTE* These buffer tubes require a rifle action spring and specific BCM MK2 buffer, carbine and rifle buffers will NOT work.
***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.***

92 Reviews

  • 5
    A5 Buffer Tube

    Great product, I have 4 now & love it

  • 5

    When married to the VLTOR A5 buffer system this is hands down the best upgrade I have done. I bought a few more and put them on every rifle I have.

  • 5
    A5 receiver extension

    I am a big fan of the Vltor A5 buffer system. BCM makes qaulity products so you never have to wonder if what you're buying will hold up.

  • 5
    Intermediate Receiver Extension

    Typical BCM—top notch, impeccable finish & runs perfect. Lightning service—what’s not to like?

  • 5
    Intermediate Buffer tube

    I've used the Bravo Co brand intermediate buffer tube on 3 builds now. Absolute quality and combines well with Vltor A5 buffers.

  • 5
    Great product

    The recommendation to try this product come from an instructor in a class I took, and my experience with it so far (with an A5H2) has been fantastic. Very noticeable impact on recoil/muzzle rise on the carbine gassed 12.5" I'm using it on. Will put these on additional guns.

  • 5
    BCM Intermediate buffer tube

    As expected with BCM, top notch! This is a great alternative to the VLTOR tube which is ridiculously hard to find!

  • 5
    Great option for the Vltor buffer tube

    I am glad BCM came with their version of the A5 tube. This is hard to find and the A5 system is a great upgrade to any AR15

  • 5
    Homegrown A5

    A locally made, in-stock A5 option with a great finish and solid fit. Incredibly fast shipping and plenty of swag, too. How can you go wrong? I like to support my local shops and will be back for more.