From the top of my head (sorry if I forget anyone):
Front Kick to the Sternum (pump)
Las Vegas Xtreme (team based out of CZP)
the new Vegas Xtreme field team
I think there are a few more, but these are what I remember right now.
As for X rated I'm not sure, there are a few of the guys spread out on other teams that are still around, but as a group haven't seen them for a while.
Sin City Legacy
Former UNLV Paintball President