C4 M-LOK Rail (Carbine Cut)

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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.
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


  • 5
    Carbine Cut

    Posted by Brad on Dec 8th 2020

    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

    Posted by DDrees on Oct 3rd 2020

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