Centurion Arms AR-15 C4 M-LOK Rails


  • Based on 2 review(s) (2)

    Availability: In stock

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Full Details & Specifications

Centurion Arms AR-15 C4 M-LOK Rails


Centurion Arms is happy to announce, and we've eagerly awaite, the C4 M-LOK rail!

The C4 M-LOK rail is based on Centurion's patented quad rail design.  This venerable design is awesome for several reasons.  The C4 is a lightweight, rugged, 2-piece design, it clamps to the OEM AR-15 barrel nut.  It can be assembled/disassembled without removing the front sight post or pinned muzzle devices.  Also, it is a strong design -- the C4 was the direct competitor to the Daniel Defense RIS rails and it was lighter, less expensive, and just as robust.  TheC4 M-LOK is bringing this design into the modern age.


  • Height:  2.38"
  • Inside Diameter:  1.37"
  • Continuous 1913 Picatinny Top Rail
  • Fasteners:  Grade 8 Bolts with Phosphate Finish

Lengths and Weights (w/ Hardware):

  • Carbine Cut:  9.5" (sides), 8.8 oz
  • Midlength Cut:  11.5" (sides), 10 oz
  • 12 In FSP Cut:  12.565" OAL, 10.9 oz
  • 12 In Rail:  12.565" OAL, 11.7 oz
Manufacturer Centurion Arms
Shipping Restriction ITAR/Export Restricted
MSRP $280.00
Weapon Model AR15/M16
Barrel Rest Free Float
Material 6061-T6 Aluminum
Material Finish Type III Hard Coat Anodized
Color Black


Customer Reviews

What the customers are saying..

Overall Customer Rating

Based on 2 review(s) (2)

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C4 is Magical

Posted by Fozzie | (Posted on 1/23/2021)

Price 4/5- Buy once, cry once.
Quality 5/5- The quality of manufacturing is outstanding, as always.
Value TBD- Only installed, yet to use... but first impression is 5/5

This is my second C4 rail. I love the old pic rail C4 on my 14.5 middy, but first impressions out of the box and newly installed on a new upper, the mlok version may be that much better.

It’s surprisingly lightweight, like all Centurion rails. Fit and finish are top notch. I bought this 12” w/o the FSP cutout for a recce type build. My favorite feature of the C4 is the use of a standard barrel nut. No proprietary or single use wrench’s to buy, and yet it locks up and stays put as well as any proprietary barrel nut used by other high end manufacturers with their rails.


Excellent free float rail system

Posted by Jesse | (Posted on 1/12/2021)

Centurion arms does it again! This is a well constructed, light weight, strong and beautifully machined rail system. Fit and finish is top-tier. The rail system is on the thinner side so if you have larger hands (like me) you may want to get fuller m-lok covers like the magpul M-Lok type 2.


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