CMR MLOK 5.56 Rail (4.5in - 15in)

Usually Ships in 2 to 3 Business Days - Custom Cerakote Lead Times Vary (See Disclaimer Below)
(22 reviews) Write a Review


Our patented CMR rail system is a lightweight, rugged, one piece, free float hand guard that, when installed, gives the upper a continuous 12 o'clock rail. The CMR system clamps to a proprietary barrel nut that can be installed on 5.56/.223 based AR platform systems. It was designed with the top 1913 rail for mounting the most common accessories, yet does away with the need for 1913 rail at the 3, 6, and 9 o'clock positions. Here, other accessories can be directly mounted to it with a dedicated, simple, light-weight, mount. However, it does allow for 1913 rail to be added, if needed, for some less common accessories. Additionally, we built in anti-rotation QD sling swivels in 4 positions. The main objective was to have a smaller, lighter weight, more ergonomic, hand guard that maintains or enhances functionality for the end user. As professional end users ourselves, we know the importance of keeping things simple and that was our design intent here... a K.I.S.S. (keep it simple, stupid) system.


Material: 6061 T6

Finish: Type III hard coat anodized

9.5in- 8.4oz with barrel nut and hardware
10.5in-9oz with barrel nut and hardware
13in-10.3oz with barrel nut and hardware
15in-11.1oz with barrel nut and hardware

9.5in (9.45")
10.5in (10.6")
13in (13.468")
15in (15.044")

Width: 1.39(body of tube) 1.75 (at QD sling swivels)

Height: 1.910(body of tube)

Inside diameter: 1.230

Rails: 1913 spec rail on top

Integrated QD Attachment sockets - Limited Movement



- Currently our gas block is the only one that Centurion Arms can guarantee to fit under the CMR. This is due to the CMR's extreme low profile.

- Screws, proprietary barrel nut, and wrench are included with the purchase of all rail systems. Replacement screws, barrel nuts, and wrenches are available to purchase if necessary.

*** We recommend gunsmith installation for all of our parts.  We cannot warranty items damaged by improper installation.

Custom Cerakote Disclaimer:

Custom Cerakote is completed per order.  Our Cerakote room runs one color at a time so your ship date will be subject to the color rotaion at the time the order is placed.  You will receive an email confirmation once the item has actually been packaged to ship.

Cerakote items are not guaranteed to match separate batches or Cerakote completed by outside parties.  While we strive to keep our mix uniformed for our own products, we can't say for certain what Walter and Jesse cooked up in their lab out in Albuquerque.



  • 5
    9.5in Mlok

    Excellent rail; lightweight, extremely sturdy, easy install. Only has Mlok slots on 3/6/9 O'clock positions but that's really all you need. Only gripe is the included barrel nut wrench is cheap and the teeth started stripping when torquing down to 60ft/lbs as instructed

  • 5
    Best of the best

    Awesome, light, small diameter rail that feels great in hand. Love the new 2 screw mounting design. Ordered a 13.5" in OD green and it turned out beautiful. You can find cheaper rails but you won't find higher quality than Centurion. Money well spent.

  • 5
    13 inch Mlok rail

    Excellent product.., lightweight and great quality. But, the best thing is the superior customer service. Every order came with a thank you. Bless you all and thank you for your service.

  • 5

    We love this hand guard. Lightest, sexiest MLOK available. Once we show a customer one, they are sold. Top quality and not too pricey. Buy afew-

  • 5
    Centurion 9.5" mlok

    Great MLOK rail, functional and great quality. measurements were accurate, QD mounts functional, and overall a very solid product.

  • 5
    CMR 13" MLOK Rail

    Out of all the rails I own, the CMR is definitely one of my favorites. The slim profile, secure fit and excellent finish make it one of the best out there. Centurion is a great company to order from, fast shipping, great correspondence and great products.

  • 5
    Mlok rail

    Light weight quality product. Will purchase again

  • 5
    5.56 MLOK 13"

    Fit and finish, profile, and durability of rail all superb. Customer service and response time is also outstanding. Own numerous CA products and always impressed with quality. Highly recommended.