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5.56 CMR Rail (9.5in - 14in)
5.56 CMR Rail (9.5in - 14in)

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Our Price: $230.00

Price with Selected Options: $230.00

Product Code: 01100

5.56 CMR Rail Style*:

5.56 CMR Rail Length*:

Custom Cerakote Options:


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

Integrated QD Attachment sockets - Limited Movement

Weight : 9.5in-9.4oz with barrel nut | 7.3oz without barrel nut

:11in-10.4oz with barrel nut | 8.3oz without barrel nut

:12in-10.7oz with barrel nut | 8.6oz without barrel nut

:13in-11oz with barrel nut | 9oz without barrel nut

:14in-11.8oz with barrel nut | 9.6oz without barrel nut

Length :9.5in (9.418”)

:11in (10.994”)

:12in (12.56")

:13in (13.688")

:14in (14.25”)

Width: 1.56(body of tube) 1.75 (at QD sling swivels)

Height: 1.995

Inside diameter: 1.12

Rails: 1913 spec rail on top

Made in USA

- 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 are included with the purchase of all rail systems. Replacement screws are available to purchase if necessary.

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 8 Write a review »

  1 of 1 people found the following review helpful:
5 of 5 New favorite rail June 13, 2020
Reviewer: Braxton from Pa  
I have a 11in cmr on a 12.5 centurion arms carbine barrel . It had very tight fit up and extremely nice finish. Its very ergonomic not so thin it feels weak and not so thick its hard to hold. Havent noticed any problem with heat . I have bought again and referred others to check them out. On a company level i have never dealt with more professional,  curtious and knowledgeable staff.

  0 of 0 people found the following review helpful:
5 of 5 cmr rail 13" October 23, 2019
Reviewer: Brody from Utah  
A great system that fit perfect with my 14.5-inch barrel pinned and welded. The attachment system is great and the gen2 is even lighter!

  0 of 0 people found the following review helpful:
5 of 5 This is a great rail. October 8, 2019
Reviewer: Ron from SC  
I put a 13" CMR on a build using Centurion's CM4 upper/lower set and really like the compact size and light weight of this rail. The length is perfect with the 16" barrel I used. I'm not a fan of bulky rails with a bunch of accessories mounted on it so this piece is perfect for my preference in a build. Like the old TV commercial used to say....try it, you'll like it.

  0 of 0 people found the following review helpful:
5 of 5 Functional, Sexy, Bomber October 8, 2019
Reviewer: Brandon Whorley from Raleigh NC  
Top notch. Handled a buddies carbine yesterday that has this rail. Perfect balance of weight and size with enough gas block clearance inside. The CMR has stood the test of time and existed way before small light weight rails were a main stream thing. All the features you need in a bomber package that's sexy. My next build will have one.

  0 of 0 people found the following review helpful:
5 of 5 Best rail system ever October 8, 2019
Reviewer: Darrin Raymond from Greenville, NC  
Love the original CMR. Have had it for a little while and it’s perfect for my colt commando. Thank you Centurion!

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