BCM® KMR *ALPHA* 13 (KeyMod™ Free Float Handguard)

MSRP: $240.00
Your Price: $224.95
(You save $15.05 )
Stock Status:


BCM® KMR Alpha 13


All the advantages and features of Bravo Company's KeyMod™ Rail, now available in 100% aluminum


Manufactured from aluminum, it is lightweight yet durable. Also featuring a proprietary patent pending mounting, indexing and lock up system that mitigates 12:00 rail movement under heat generated from the barrel nut.


Handguard alone weighs 7.8oz!


1.3 Inner Diameter

1.5 OUTSIDE flat to flat.

Handguard flares forward (towards muzzle end) at the 3 and 9 O'clock positions approximately 1/4"

Actual length when measured to flare is 13.4"

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

Mounting hardware, 2.4oz, for a total of 10.2oz on a very long 13 rail.


The KMR Alpha is hardcoat anodized for corrosion resistance as well as to maintain a non-reflective finish.


The KeyMod interface system was developed by Eric Kincel (now the Director of BCM's product development team) to work in parallel with the current picatinny system. In many applications it will advance modularity past the current 1913 rail system.


The BCM KMR Alpha also allows for a larger range of modularity offering 4 different offset mounting positions between traditional 3,6,9, and 12:00 positions.


In the most basic of applications the KeyMod system allows for universal modularity between various manufacturers of accessories, and accessory rails. A big win for the trigger puller. As the industry advances the modular accessories will mount directly to the KeyMod instead of picatinny, allowing for a lighter, cleaner, and less bulky weapon system.

*Includes BCM KeyMod Sling Mount

Please note: Nylon/Polymer Picatinny rail sections are for NON-load bearing accessories only. For load bearing accessories, we recommend aluminum Picatinny rail sections. Do NOT exceed 20 in/lbs. when securing KeyMod Fasteners on Polymer accessories. Aluminum Picatinny rail sections may be torqued to 30 in/lbs


Installation manual for the BCM® KMR Handguard

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.***

244 Reviews

  • 5

    Wow is all I can say...I have a 10-inch MCMR rail on a 14.5-inch barrel and decided to go with a longer rail, unfortunately, I couldn't locate a 13-inch MCMR because of the shortage out there so I decided on the 13-inch KMR...no disappointments looks good and works well, strong and tough I am very pleased.

  • 5
    Super easy install

    Took a bit of heat and a rubber mallet, she was snug, but fit great. Super light as well.

  • 5
    KMR 13 Handguard

    Great tight fit, solid platform as usual. I used it to update an old heavy barreled A2 mid length system rifle. Using this rail , a lighter barrel profile, and a low pro gas block. It breathed new life into an old outdated rifle.

  • 5
    Key mod rail

    Shipping was very quick as always with BCM. Love the handguard very nice beautiful Machining almost hate to bang it up. As with all BCM products I've never been disappointed other than they just don't have enough to go around..

  • 5
    Kmr handguard

    The products from BCM are very well design and made to top notch quality my personal opinion is I would put them up against any other manufacturer on the market today
    I have lonely one thing I wish they would make ar 10 products

  • 5
    Bcms guards

    The absolute best! I own several in different lengths!

  • 5

    Ive installed a ton of rails and this one was a little more challenging due to the tight fit of the rail to barrel nut .. Not a big deal as i know it will stay put as should .As always with bcm you get the best Product you can get .

  • 5
    KMR Alpha Handguard

    Extremely light for a 13” rail, fit and finish is perfect. Only complaint I have is your logo is white and sticks out on an all black rifle

  • 5
    KMR Alpha 13

    Awesome guard, great fit for my 16” barrel. You will need a heat gun or a good hair dryer.