The Centurion C4 drop in, free float 2 piece rail system features a patent pending design which is not only lightweight but is extremely rugged. When installing on a flat top AR-15, this 2 piece free float system will provide you with a continuous 12 O'Clock rail. This 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 system on any carbine length upper assembly without going through the hassle of removing the front sight post, or trying to remove muzzle device especially if it is permanently attached.

Specifications and Features:
Centurion Arms C4 Rail Carbine Length Rail 0609-CC
6061-T6 Aluminum
Type III hard coat anodized
Fastens with grade 8 bolts with phosphate finish (Included)
Inside Diameter 1.37"
Top Length 7.25"
Sides 9.5"
Bottom 8"
Height 2.38"
1913 Spec rail with proper T-Marks
Weight 10.5 with screws (1.1 oz more with standard barrel nut)
2 Piece Free Float Hand Guard
Lightweight Most Rigid Rail
Rugged Design
Designed to clamp to a standard Barrel Nut
No Need to remove the front sight post or muzzle device in order to install this free float hand guard
Made in the USA
Matte Black

Fits:
AR-15, M4, and M16 Carbine Length Weapon Systems