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

MSRP: $200.00
Your Price: $189.95
(You save $10.05 )
(70 reviews) Write a Review
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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.


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.***

70 Reviews

  • 5
    MCMR 13

    Posted by JDURHAM45 on Jul 7th 2021

    I installed the MCMR on a 13.7 barrel with a Deadair keymo adapter, in order to have a tight gap to the silencer I milled .2”off the sides which gives a nice .125” gap between the HG and silencer. It is nearly the exact same diameter as the Deadair sandman S and it looks good,
    I would buy again and recommend even if modifications are needed it’s a very solid platform.

  • 5
    MCMR 13

    Posted by Willie Pete on Jun 27th 2021

    I have used the keymod version of this rail in the past, and the M-LOK version is just further proof that these rails are truly among the very best the industry has to offer. Certainly on par with Knight's, Geissele, etc. I'll be using this with a 13.9" Criterion Core barrel (still waiting) and a Sandman K (NFA jail).

  • 5
    Mcmr handguard 13

    Posted by Owen Gardiner on Jun 24th 2021

    What we have all come to love and respect from BCM . Top quality , fit and finish . Fast shipping and wonderful customer service .

  • 5
    Too Long for 13.7 Inch Barrels with Suppressors

    Posted by Nic on Jun 23rd 2021

    This is a great rail. I've ordered 3 or 4 of these in the past and they have all worked great. I purchased this 13 inch MCMR to put on a 13.7 inch build. The MCMR is just a hair too long when trying to attach a Surefire suppressor. Removing some material will be required. Otherwise, I suggest purchasing a shorter version. Overall, would buy again.

  • 5
    Mcmr handrail

    Posted by Johnnybravo on Jun 23rd 2021

    I bought an m c m in the past from Bravo Company and have it on one of my AR-15 which fits like a glove to my Bravo Company upper receiver assembly. I have yet to attach the new ones I purchased since I cannot seem to get my hands on another upper receiver assembly until they become available. I'm sure this one will work just as good as the last time I purchased the handrail. As soon as one comes available please let me know ASAP thank you very much I will definitely purchase Bravo Company again in the future.

  • 5
    Best rail on the market.

    Posted by Dale on Dec 18th 2020

    I have the 13” and they are great. I wish you made a 15” that would fit a M&P 10.

  • 5

    Posted by Randy Furusho on Dec 18th 2020

    NIce sturdy handguard which inspired me to build another project upper. Wouldn't expect anything less from BCM. Just waiting for 15's to come back in stock for my system project.

  • 5

    Posted by Matt on Dec 17th 2020

    Great handguard. Insanely tight and sturdy fit. great feel around the hand, easily one of the best handguards out there. Just another solid product from BCM

  • 5
    BCM for the win

    Posted by C.Wick on Jul 23rd 2020

    got this to pair with my 13.7" barrel. The two side protrusions go about half way up the threads on it, so be aware of that if you plan on running a suppressor with a QD. Other than that, its solid, as expected from BCM!!