5.56 MLOK Rail (9.5in - 15in)

(10 reviews) Write a Review

*NOTE* Pictures do not show current design of ML1510, 1513 and ML1515. Current design has new 2-screw and center locking insert, as well as subdued CNC engraving (no white markings) ML1509 is still as shown.


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

Weight: 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

Length: 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 and proprietary barrel nuts are included with the purchase of all rail systems. Replacement screws and barrel nuts are available to purchase if necessary.


  • 5
    Centurion 9.5" mlok

    Posted by Jacob Solomon on Sep 9th 2020

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

  • 5
    CMR 13" MLOK Rail

    Posted by Chad on Nov 10th 2019

    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

    Posted by Scott on Oct 31st 2019

    Light weight quality product. Will purchase again

  • 5
    5.56 MLOK 13"

    Posted by Shaun on Oct 30th 2019

    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.

  • 5
    mlok rail 13"

    Posted by Brody on Oct 23rd 2019

    I had purchased the c4 rails for other projects and had no problem feeling confident in purchasing the mlok rail when it became available. It locks up tight and has built-in QD mounts. I have put this on two rifles.

  • 5
    Perfect hand guard

    Posted by Brian on Oct 10th 2019

    Ever since I picked up the original CMR rail, I hoped Centurion Arms would come out with a MLOK version. The diameter of these hand guards is perfect IMO. I dig how simple and strong all of their hand guards are, and now they come in MLOK flavor! These are the only hand guards/rails anyone needs.

  • 5
    Slim and Trimmed

    Posted by Dean on Aug 10th 2019

    This rail came on the complete upper I bought, it is robust yet slim. You'll have no problem getting your hands around it for a positive purchase. Mounting system looks and feels very strong.

  • 5
    MLOK 13" Rail

    Posted by Henry on Aug 10th 2019

    Lightweight, slim in the hand, and most importantly , sturdy . I have this Rail on my CM4 and the same Rail on a 16" build. Totally happy with Centurion Arms products .