The Centurion C4 comes in two lengths, the 7 inch Carbine and the 9 inch Midlength. Both of these are designed to lock onto a GI barrel nut with the delta ring assembly removed. This allows the rail to upgrade any M4 or AR15, without needing a proprietary mount.
The PTS Centurion CMR, like the real one, mounts to an included barrel nut, and offers free float performance with modular adaptability. The CMR has 4 QD sling swivel sockets for simple sling mounting, as well as mount points for CMR series accessories. The forward 3 accessory mount points are steel reinforced for extra durability.
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