The JT Tactical is basically the same thing as the older version of the BT Omega, and shares a lot of parts with the less-expensive BT blowback semis in the BT-4 family.
It uses Tippmann-fine threading, so it takes X7/A5/Carbine/Pro-lite barrels.
A Tippmann Cyclone feed will not fit without extensive modification, if at all, but the BT alternative, the Rip Clip, will. However, since the JT Tactical can use "normal", non gun-specific aftermarket loaders like the Invert Too or Kingman Fasta, I would recommend getting one of those instead.
Since your gun is basically a BT gun, you might want to check out the BT Picture Thread for upgrade inspiration: http://www.pbnation.com/showthread.php?t=2183536
My advice though, would be to upgrade your tank, mask, and loader before anything else.