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: Current version of the rail has some slight cosmetic differences from stock photos
Engraving is now machine engraved and black anodized….no white markings.
Material: 6061 T6
Finish: : type 3 hard coat anodized
Rails: 1913 spec rail
Fasteners: grade 8 bolts phosphate finished
MADE IN USA
Weight: 14.2oz with screws—1.1oz with standard barrel nut
Inside diameter: 1.37
**DOES NOT CO*ME WITH BARREL NUT*