BCM® MCMR-8 (M-LOK® Compatible* Modular Rail)

MSRP: $180.00
Your Price: $171.95
(You save $8.05 )
(17 reviews) Write a Review
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BCM® MCMR-8 (M-LOK® Compatible* Modular Rail)

Featuring the same industry leading barrel nut and lock up design as originally introduced on BCM's evolutionary KMR handguard, the MCMR Series of handguards gives the shooter modularity in the M-LOK platform.

This proprietary patented mounting system (US Patent 8904691), includes a mechanical index to the 12:00 rail and positions mounting hardware to mitigate the movement caused by heat generated by the weapon system.


  • MCMR features M-LOK Compatible mounting system.
  • Free Float Handguard eliminates loads from barrel, reducing the deflection for more accurate shooting.
  • Precision Machined Aerospace 6061-T6 Aluminum Alloy, for high strength and lightweight.
  • Proprietary engineered profile offers additional cross sectional strength.
  • Steel Barrel Nut (same KMR, MCMR, and QRF series), to resist movement under heat.
  • Hard Coat Anodized per Mil-A-8625F, Type III, Class 2
  • Handguard alone weighs 5.3 oz
  • Handguard mounting hardware 2.3 oz
  • Includes BCM M-LOK Compatible Sling Mount, (FREE for a limited time)
  • 1.3" Inside Diameter
  • 1.5" Wide

Actual length when measured to flare is 8.14"

Designed to be used with a pistol length or carbine length gas system with a low profile gas block.



The barrel nut will fit over all mil-spec diameter barrels (max of 1")


Bravo Company MFG, Inc. US Patent 8904691

Please note: Nylon/Polymer Picatinny rail sections are for NON-load bearing accessories only (grips, hand stops, light mounts). For load bearing accessories (bipod mounts, sling mounts, vertical grips, barricade supports), we recommend aluminum Picatinny rail sections. Do NOT exceed 20 in/lbs. when securing fasteners on Polymer accessories. Aluminum Picatinny rail sections may be torqued to 30 in/lbs.

*M-LOK® is a registered trademark of Magpul Industries Corp.


WARNING: This product can expose you to chemicals including Cumene and Titanium Dioxide, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov

***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.***

17 Reviews

  • 5
    Best I've used

    Posted by Kameron on Aug 18th 2021

    I've built two uppers using BCM rails and they're awesome. Super lightweight, very durable, and really simple to install. One is on a 9" 300 blk build and the other is on a 16" 5.56 build, both performing perfectly without any flaws. Highly recommended!

  • 5
    Solid rail

    Posted by Damon on Aug 8th 2021

    Great rail. Just really hard to install. But I guess that means that it won’t move either

  • 5

    Posted by Justin on Jul 29th 2021

    Great quality product. The handguard was very difficult to slide over the barrel nut. I had to heat up the handguard and tap it with a mallet to get it completely over the nut. I appreciate a snug fit, but that was borderline obnoxious. That said, the build was successful and looks and feels great. Next time instead of using the upper vice block, I'll use a reaction rod.

  • 5
    BCM hand guard

    Posted by Adam on Jan 19th 2021

    A+ as always from BCM

  • 4
    A bit over 8"

    Posted by Nick on Jan 13th 2021

    Rail is 1/8" over 8", needed exactly 8" for clearance. Machining and finish were fantastic and it was extremely light weight.

  • 5
    Mcmr 8

    Posted by Sky on Jan 9th 2021

    The price is right to me, it shipped quick and Arrived on time, assembly was painless, came with everything needed plus extras, I’ve already bought more for the rest of my ARs. Great product from a great company.

  • 5
    Best Handguard

    Posted by Michael on Jan 5th 2021

    This is by far one one of my favorite handguards! Light, functional, easy to install!

  • 5
    Best Company Ever

    Posted by Gabriel Valencia on Dec 27th 2020

    I use the the MCMR hand guards on both my AR's one a pistol the other a rifle and installation is easy and the material is solid definitely a 5/5 i continue to also use ther parts from this company aswell

  • 5
    8" MCMR Handguard

    Posted by Mark Sherrod on Dec 27th 2020

    The best and ONLY handguards I will use for any build!!