BCM® MCMR-13 (M-LOK® Compatible* Modular Rail) Flat Dark Earth

MSRP: $200.00
Your Price: $189.95
(You save $10.05 )
(16 reviews) Write a Review
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2 units
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Out of stock

BCM® MCMR-13 (M-LOK® Compatible* Modular Rail)
Flat Dark Earth Cerakote (LIMITED QTYS)

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 8.2 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 13.4"

Designed to be used with pistol length, carbine length, mid length, or Mil-Spec M16 rifle length gas systems; all 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.***

16 Reviews

Write a Review
  • 5
    13" MCMR FDE

    Posted by Jerry Chao on May 26th 2020

    I love the tight fit of these rails and the need to use a heat gun to get the rail onto the barrel nut. This replaced a KMR-A so it was a perfect fit. The FDE color actually matches the Magpul furniture perfectly on my "50 shades of FDE" build (just the stock...I prefer the BCM Mod 3 grip which I also purchased for this build). Overall great product and great service. Thanks!

  • 5

    Posted by neil friedman on May 20th 2020

    This is no sissy toothpick rail. fits snug, is light, and all my evil 2,000 round per second clips go perfect with this rig.

  • 5
    Hand guard

    Posted by Al Sternenberg on May 18th 2020

    Fantastic equipment

  • 5
    FDE MCMR rail

    Posted by Jon McLeod on May 18th 2020

    The rail is machined well, advertised weight is correct (10.4 oz I think with barrel nut and hardware) the FDE is a great shade for my build.

  • 5
    13 inch rail

    Posted by Jon on May 14th 2020

    Got this rail for my 13.7 build to have the rail come out as far as possible to the muzzle device (haven't shot it yet). The item shipped fast and like all BCM products high quality at fair price. Such a good price my wife was even impressed. I do like how the barrel nut position is separate from the rail position making it easier to get the rail lined up with the upper. Overall very happy and can not go wrong with any BCM products but this rail is the way to go.

  • 5
    BCM MCMR 13

    Posted by Anonymous on Apr 23rd 2020

    Always quality. Well coated, SUPER affordable, feels strong and is very lightweight. Will always recommend

  • 5
    Great rail.

    Posted by Ricky "The Rocket" Rogers on Apr 21st 2020

    I have had several KMR-A's over the years but decided to give the MCMR a go. Love it. The flat dark earth looks great; matches Magpul's FDE furniture. The laser etching is super crisp. After messing with some accessories I have come to like M-lock. The down side is often I have to trim the accessary bolts down so they don't hit my barrel. I am running a thicker barrel, however; the BCM SAM-R 20" in ion black. The barrel and rail combo looks sick. Love all of BCM's rails; they are my go-to for sure. I think keymod is easier, but I can see how M-lock is likely stronger.