The MLOK C4 rail system is based off the patented quad rail version. It is a lightweight, rugged, 2-piece free float rail that when installed gives the uppers a continuous 12o’clock rail and MLOK slots for the 3,6, and 9 o’clock positions. 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.

Fits MIL-Spec uppers.  Many billet uppers will not accept the alignment tabs without modification.  Any modification will make the rail ineligible for return.

**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

Features

Material: 6061 T6

Finish: type 3 hard coat anodized

Weight: 8.9 oz with screws — 1.1oz more with standard barrel nut

Length: Top 9 1/4in Sides 11 1/2in Bottom 10 5/8in

Height: Install 1.988 / End of rail 1.035

Inside diameter: 1.37

Rails: 1913 spec rail

Fasteners: grade 8 bolts with phosphate finish

MADE IN USA

***Please Note***

– Screws are included with the purchase of all rail systems and replacement screws are available to purchase if necessary

– Hex wrenches/keys are not included but installation will require 9/64″ and 3/32″ SAE Hex Keys