C4 M-LOK Rail (Carbine Cut)

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

Centurion Arms LLC is happy to announce the C4 MLOK® rail.


The MLOK C4 rail system is based off the patented quad rail version. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o'clock rail and MLOK slots for the 3,6, and 9 o'clock positions. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR15, M4, and M16 type weapons systems. This design allows the installation of the rail on an upper assembly without removing the front sight post or permanently attached muzzle devices. **Please note that some FSBs may need to be modified to fit by filing down the longer sling attachment ears so that they are not touching the handguard
Material: 6061 T6
Finish: type 3 hard coat anodized
Weight: 7.7oz with screws --- 1.1oz more with standard barrel nut
Length: Top 7.25 in Sides 9.5 in Bottom 8 in
Height: 2.38
Inside diameter: 1.37
Rails: 1913 spec rail
Fasteners: grade 8 bolts with phosphate finish

***Please Note***

- Screws are included with the purchase of all rail systems and replacement screws are available to purchase if necessary

- Hex wrenches/keys are not included but installation will require 9/64" and 3/32" SAE Hex Keys

*** 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

    This rail IS all that and a bag of CHIPS.
    Installation- EASY
    Fitment- Perfect
    Finish- Beautiful/ Sexy
    Brought my A2 pistol out of the past and into the future!

  • 5
    Carbine Cut

    I can’t be more happy. This handguard is amazing. The pictures don’t do the handguard justice when it comes to craftsmanship, design and solid durability. This is my new favorite handguard for carbine length solutions.

  • 5
    Mlok c4 rail

    Fantastic so far! Easy installation. Absolutely rock solid rail! Feels fantastic in the hand and keeps that FSB big pp energy