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The BCM MK2 Receiver Extension is Bravo Company's take on the intermediate, or A5-length, buffer tube, and it's one of the cleaner ways to smooth out how your AR runs. It sits about three-quarters of an inch longer than a standard six-position carbine tube, which opens up room for the longer MK2 buffer and a full rifle-length action spring. That extra travel is where the magic happens. The heavier buffer and longer spring work together to slow bolt carrier velocity, drop the cyclic rate, and soften the recoil impulse you feel at the shoulder. If you shoot with a red dot or LPVO, that translates to a flatter gun that lets you stay on target and track your hits.
This tube is machined from 7075-T6 aluminum and hard-coat anodized to Type III, Class 2 spec, so it holds up to the kind of banging around a working rifle sees without wearing through. Builders consistently call out the fit and finish here as some of the best in the A5 category, and many mention the dry-film lube on the inside that helps everything glide. It carries a mil-spec diameter where the stock rides, so it plays nice with USGI, BCM GUNFIGHTER, Colt, LMT, SOPMOD, VLTOR, Stag, and Magpul CTR stocks, along with pretty much any other mil-spec collapsible unit.
Unlike a standard carbine tube, the MK2 gives you eight adjustment positions instead of six, so you've got more room to dial in your length of pull. It works on AR-15, M16, and M4 lowers, and it'll also serve as a receiver extension on most AR-10 platforms. Plenty of folks run it on 16-inch mid-length builds, SBRs, and .308 rifles where taming the recoil impulse really pays off.
One thing to keep straight before you order: this is a proprietary-length setup. It will not run standard carbine or rifle buffers and springs. You'll need a BCM MK2 buffer and a rifle-length (M16) action spring to make it work. Because the tube runs longer than a carbine unit, some stocks may not fully collapse against the lock nut, which is just the nature of the A5 length.
No. This is an A5-length tube, so it requires a BCM MK2 buffer and a rifle-length (M16) action spring to function properly. Standard carbine or rifle buffers and springs will not work and can hurt reliability. Plan on picking up the correct MK2 buffer and rifle spring to complete the setup.
It uses a standard mil-spec diameter where the stock slides on, so it works with USGI, BCM GUNFIGHTER, Colt, LMT, SOPMOD, VLTOR, Stag Arms, Magpul CTR, and other mil-spec collapsible stocks. Keep in mind the tube runs about three-quarters of an inch longer than a carbine tube, so some stocks may not collapse all the way closed against the lock nut.
The longer tube makes room for a heavier buffer and a rifle-length spring, which slows bolt carrier velocity and lowers the cyclic rate. The end result is a softer, smoother recoil impulse and often better reliability across different gas system lengths. Many shooters find it makes the rifle flatter and easier to track through an optic.
Yes, BCM notes these receiver extensions can be used on most AR-10 platforms in addition to AR-15, M16, and M4 lowers. It's a popular choice on .308 builds where reducing the recoil impulse makes a noticeable difference. As with the AR-15, you'll still need the matching MK2 buffer and rifle-length spring.
| UPC | 812526023599 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | BCM-MK2-RE |
| Color | Black |
| Model | |
| Product Type | Buffer Tube |
| Style | Mil-Spec |
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