Centurion Arms AR-15 C4 Rail System - 12.0 FSP

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. Features: 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 MADE IN USA Please NOTE: Barrel Nut Sold Separately. 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.