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

MSRP: $200.00
Your Price: $189.95
(You save $10.05 )
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
    BCM KMR Rails

    I own 6 and I'm very happy with their products.

  • 5
    13in KMR rail

    Superb quality especially for the price! BCM is the best! Don't hesitate to buy!

  • 5
    BCM kmr 13 alpha hand guard

    Very nice hand guard fits tight looks and feels great very light weight and comes with a rail section and sling attachment.

  • 5
    KMR 13

    Best handguard I've had. Second one I've installed and as long as you can follow the instructions it goes on easy enough. (Get a bigger hammer does NOT apply here.) Whether Keymod or MLOK they are top tier handguards.

  • 5
    Excellent Product

    Solid construction. Very happy with my purchase!

  • 5
    Best detailed installation instructions

    After purchasing a complete bcm upper over a year ago. I was sold on the slim and light profile of the kmr alpha free float handrail. I had recently built myself an upper in a 6.5 grendel and the rail was the last component needed in my build. After the rail was delivered I was pleased to find detailed installation instructions to make sure my rifle would not fail. Just test fired and zeroed in the rifle yesterday at the local range and am very pleased the performance on how it all worked out.

  • 5
    Excellent choice no regrets.

    Arrived ahead of expected date. Came while I was at work I’m 54 but it was like Christmas from my childhood when I got home that day .install went well after removal of front sight delta ring etc. looks great shoots great. Ready for zombie apocalypse highly recommend .

  • 5
    Awesome Rail and Awesome Service!

    Everything about BCM is EXCELLENT! The products, the customer service and the staff is nothing but PERFECT AND EXCELLENT!

  • 5
    Very happy

    Fast shipping, great communication, happy customer.