The Centurion patented C4 rail system is a lightweight, rugged, 2 piece free float rail that when installed gives the uppers a continuous 12oclock 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.
Material: 6061 T6
Finish: : type 3 hard coat anodized
Weight: 8.7oz with screws---1.1oz with standard barrel nut
Inside diameter: 1.37
Rails: 1913 spec rail
Fasteners: grade 8 bolts phosphate finished
MADE IN USA