Centurion Arms LLC is happy to announce the C4 M-LOK® Rail.

The M-LOK® 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 12 o’clock rail and M-LOK® 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 Aluminum
– Finish: Type 3 hard coat anodized
– Rails: 1913 spec rail
– Fasteners: Grade 8 bolts, phosphate finished
– QD sling swivels front and rear on both sides


  • C4 M-LOK Rail (Carbine Cut) – $280.00
    • (Intro Price $238.00) Pre-Order, Shipping by Mid-March
  • C4 M-LOK Rail (12in) – $310.00
    • (Intro Price $263.50) Available NOW
  • C4 M-LOK Rail (Mid Cut) – $320.00
    • (Intro Price $272.00) Pre-Order, Shipping by Mid-March
  • C4 M-LOK Rail (12in FSP) – $350.00
    • (Intro Price $297.50) Pre-Order, Shipping by Mid-March