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

MSRP: $240.00
Your Price: $224.95
(You save $15.05 )
Maximum Purchase:
5 units
Stock Status:

Out of stock

BCM® MCMR-13 (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 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.


***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.***

109 Reviews

  • 5

    Best rail on the market

  • 5
    13" MCMR Handguard

    The MCMR handguard is great! It's not heavy and it's built really solid. The MCMR fits great in my hand regardless of the positions I'm shooting in. Other than being built very good it, looks great! I would definitely recommend this handguard to anyone looking for one thats built tough and will last. Also seeing then BCM logo on the side let's me know that there is years of experience in the design of the handguard and thats something I can trust.

  • 5
    The best

    These rails are just fantastic. Superior design and build quality. The fit and finish is flawless. Absolutely the best value when compared to more expensive, heavier rails from other manufacturers.

  • 5

    Great rail. Lightweight, sturdy. Worked perfectly with my 13.7 Noveske Infidel barrel, adjustable gas bloc, and SureFire Warcomp.

  • 4
    Excellent quality

    Happy customer, as usual

  • 5

    Just replaced my key mod hand guards and I’m happy with the results. Always enjoy doing BCM products.

  • 5

    Outstanding product especially when you consider the price. I would expect nothing less from Bravo.

  • 5
    Solid handguard

    I have bought several other BCM products previously and each one has been great. The MCMR rail has been amazing, though. The interference fit allows for exactly ZERO play before you even get the mounting hardware installed. Set up with the proper gap from the upper, it offers excellent accuracy. Also, huge props for the quality instructions and providing everything you need for install, minus the torque wrench.

    My only complaint is that the torx key provided for the hardware isn’t the best. The instructions call for a torque spec, so a torx adapter for a ratchet would make more sense, in my opinion. Also, the provided key has a small bump on the tip of the torquing ends. As a mechanic, I prefer drivers and keys that are flush, as they don’t allow the key to wobble inside the head of the hardware while torquing. This is a very minor complaint though and the torx socket can easily be sourced, as you will already have to do for the torque wrench. I mean, they even provide the Loctite called for in the installation instructions.

    Excellent product, all the way around.

  • 5

    The rail is slim and light, but very strong and sturdy.