i recently bought a used benelli m2 12 ga and it came with an extended choke tube that the previous owner bought and i was trying to find out what kind of tube it was. the only markings it has on it are MD 11099. can anybody help?

The M2 hasn't been out that long, crio choke system, not that many after market sources. can you describe the choke a little more? Extended to me either means knurled or ported past the end of the barrel. Are there any choke markings? small notches in the front of the choke? Asterisk(*) etc?

The M2 hasn't been out that long, crio choke system, not that many after market sources. can you describe the choke a little more? Extended to me either means knurled or ported past the end of the barrel. Are there any choke markings? small notches in the front of the choke? Asterisk(*) etc?
there is only the numerical markings on the choke-no marks like the standard criochokes have on them, but it is not ported,just knurled.