BCM® Intermediate Receiver Extension (A5 Buffer Tube)

(77 reviews) Write a Review
Stock Status:
For your AR15, M16, M4. A5 receiver extension (buffer tube) 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 A5 buffer, carbine and rifle buffers will NOT work.

If you require a complete A5 kit, please click here
***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.***

77 Reviews

  • 5
    Great product

    Posted by AK on Nov 2nd 2020

    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

    Posted by William Valenzuela on Oct 22nd 2020

    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

    Posted by Peter Blanco on Oct 20th 2020

    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

    Posted by James D on Oct 18th 2020

    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.

  • 5
    BCM intermediate buffer tube

    Posted by Brian on Oct 9th 2020

    Great product

  • 5
    bcm a5 receiver extension/buffer tube

    Posted by awesome on Oct 8th 2020


  • 5
    Great product

    Posted by JamesB on Aug 31st 2020

    What can I say, it's BCM and a A5 tube. I run it on 2 rifles now. A cmmg rdb 9mm with blitzkrieg buffer and a standard build with vltor buffer. Gives you more LOP and helps with recoil. Good stuff

  • 5
    well made.

    Posted by Ryan Warren on Aug 23rd 2020

    Seems very sturdy, has some kind of coating inside. Intermediate buffer system runs super smooth.

  • 5
    Buffer tube

    Posted by Shane on Aug 16th 2020

    Seems like a buffer tube. I remain suspicious. If I ever manage to get enough parts together to actually make a gun, I’ll let you know. Maybe 6 months from now. Fuckin 2020.