BCM® Intermediate Receiver Extension (A5 Buffer Tube)

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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.***

47 Reviews

  • 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.

  • 5
    BCM A5 Tube

    Posted by John Wyatt on Aug 7th 2020

    Awsome substitution for the vltor, have purchased two of them and will continue purchasing them on my future builds. The quality is unmatched.

  • 5
    Intermediate Reciver extension tube

    Posted by Erik on Jul 23rd 2020

    Great, works great. An upgrade that actually works and helps reliability. Using on a 12.5 in 5.56 solgw barrel on an aero upper, bought a second one for my 10.5in 300blk I'm using for hunting.

  • 5

    Posted by Anonymous on Jun 23rd 2020

    Installed on my 308 AR with rigld buffer spring and 5.5 oz buffer. Feels like there is less recoil compared to my other 308 with carbine buffer.

  • 5
    BCM intermediate receiver extention

    Posted by Tim L. on Jun 5th 2020

    Quality item. Well made. Works well with all other A5 buffer accessories

  • 5
    A+++ top notch

    Posted by Anonymous on May 21st 2020

    You know anything BCM makes it top notch quality and to top it off there service can not be beat at the same time I ordered this I had 2 other orders that the company’s kept delaying because of the virus.....BCM shipped them that day and it was in my mailbox in 2 days compared to the other 9+days

  • 5
    A5 length receiver extension

    Posted by Daniel on May 19th 2020

    The A5 system developed by VLTOR and fielded by the USMC is an awesome upgrade. Compared to the conventional carbine length receiver extension and buffer. It effectively reduces felt recoil.

  • 5
    Tube for A5 system

    Posted by Derek on Apr 25th 2020

    I bought this buffer tube to use a Vltor A5 system as it's impossible to find one from them. The fit for the buffer and springy green spring is perfect and snug. The finish of the tube is exactly what you would expect from BCM and that's why I picked it.