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

MSRP: $200.00
Your Price: $189.95
(You save $10.05 )
(56 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.***

56 Reviews

  • 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!!

  • 5
    BCM 13" handguard

    Posted by James Hill on Jul 17th 2020

    Beautiful handguard. Lightweight and feels very durable. My first BCM handguard and wont be the last. I haven't inatalled it yet, waiting on my Rosco 13.7 inch barrel

  • 5

    Posted by Clay on Jul 16th 2020

    I have built 12 of my AR’s with these BCM rails. They are phenomenal. I have never had any issues. These rails are a perfect fit in the hands and I have never had an issue retaining zero with my peq-15 rail mounted

  • 5

    Posted by Danny on Jul 3rd 2020

    Its sleek, its comfortable, has excellent QC, and has an extremely snug fit. What more could you want?

  • 5
    bcm mcmr 13 inch handguard

    Posted by Edward marley on Jun 29th 2020

    Fantastic handguard. Spec is super tight and fit super well. Construction is great and super light overall. Took it out immediately after finishing the build and is honestly one of the best handguards I've ever used. Probably going to use BCM guards from now on

  • 5
    MCMR Handguard

    Posted by Shane on Jun 24th 2020

    I have (3) of these MCMR handguards, one being on my back up duty rifle and others for personal home defense.
    Best handguards in business, have a lot of rounds down range with them and they have held up to the abuse despite being very lightweight I was very surprised. Anything BCM made is of extreme high quality, and something I trust my life with on or off duty. THANK YOU!