Centurion Arms C4 Rail 12in Front Sight Pocket Rail Handguard (for Carbine Gas Systems)


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The Centurion patented C4 rail system is a lightweight, rugged, 2 piece free float rail that when installed gives the uppers a continuous 12o’clock rail. 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

**Please Note: Current version of the rail has some slight cosmetic differences from stock photos
Engraving is now machine engraved and black anodized….no white markings.

*** We recommend gunsmith installation for all of our parts.  We cannot warranty items damaged by improper installation.


Material: 6061 T6

Finish: : type 3 hard coat anodized

Weight: 14.2oz with screws—1.1oz with standard barrel nut

Length: 12.56in (pocket located for carbine length front sight post)

Width: 2.1in

Height: 2.38in

Inside diameter: 1.37

Rails: 1913 spec rail

Fasteners: grade 8 bolts phosphate finished


***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



Additional information

Weight 14 oz
Dimensions 14 × 4 × 6 in

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1 review for Centurion Arms C4 Rail 12in Front Sight Pocket Rail Handguard (for Carbine Gas Systems)

  1. michael (verified owner)

    Absolutely amazing rail. Love the quality and bto always ships fast af boi

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