Centurion Arms C4 MLOK Rail 12″ Carbine FSP


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

C4 MLOK 12in FSP (For Carbine Gas FSB’s)

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. **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: 9.8 oz with screws — 1.1oz more with standard barrel nut
Length: 12.565in
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.


Additional information

Weight 14 oz
Dimensions 14 × 4 × 6 in

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