Centurion Arms C4 Quad Rail Handguard - Carbine Cutout

Centurion Arms C4 Quad Rail Handguard - Carbine Cutout The Centurion patent-pending C4 rail system is a lightweight, rugged, 2-piece free-float rail that, when installed, gives the upper a continuous 12 o'clock rail. The C4 system is the lightest and most rigid rail that clamps to a standard barrel nut on all AR-15, M4, and M16-type weapon 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: 10.5oz with screws - 1.1oz more with standard barrel nut Length: Top 7.25 in, Sides 9.5 in, Bottom 8 in Height: 2.38 Inside diameter: 1.37 Rails: 1913 spec rail with proper T-marks Fasteners: grade 8 bolts with phosphate finish MADE IN USA ***Please Note*** Screws are included with the purchase of all rail systems. Replacement screws are available to purchase if necessary. Barrel nut is not included