Colt 6933 11.5″ 556 Centurion C-4 MLOK Rail


Out of stock

SKU: COLT-6933-C4-MLOK Category:


Colt’s Manufacturing, Complete Upper, 223 Rem/556NATO, 11.5″ Lightweight Barrel, Black Finish, A2 Fixed Front Sight, Magpul BUIS Rear Sight

  • Precise Manufacturing
  • Long Term Reliability
  • Durable Construction


High quality components and precise manufacturing makes Colt Products ideal for both new shooters and experienced gun owners. The durability, reliability and excellent build quality will provide years of service you can count on.

Centurion Arms LLC is happy to announce the C4 MLOK® rail.


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.
Material: 6061 T6
Finish: type 3 hard coat anodized
Weight: 7.7oz 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
Fasteners: grade 8 bolts with phosphate finish


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