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.***

43 Reviews

  • 5

    Posted by Unknown 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 Unknown 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.

  • 5
    Worth the money!

    Posted by Chuck on Aug 6th 2019

    I couldnt get a competitors A5 Receiver Extension kit and so I decided to give this one a try, it is well made and structurally very solid, worked great with a JP rifle spring and Vltor buffer.

  • 5
    well made alternate for A5 use

    Posted by Steve H on Jun 4th 2019

    received in a timely manner - same quality as the previous one I got from BCM - you can buy BCM tubes with confidence if you had any doubts. I expect it will function as required.

  • 5

    Posted by Jimmy Bercian on Jun 4th 2019

    Seriously I can’t put into word what a great experience(s) I’ve had with BCM. Awesome products, awesome customer service, fast shipping, I can go and all day. Just don’t ever sit on the fence with BCM just pull the trigger and buy whatever it is your looking at you won’t ever regret it. Bought an upper few years back and i got the best gun whenever I hit the range. Like I said I can go on. Thank you BCM!

  • 5
    Great product

    Posted by Donald on May 25th 2019

    Great product and shipped fast.