I talked to Johnny Rotten about this a few weeks ago. Yes, the feed tubes come off and they are standard impulse threads. The high rise feed tube that comes stock is GREEN loctited on. In order to get it off you are going to need a strap wrench.
The best setup you could hope to obtain for warp on a rat is a lowrise with a 90 degree warp adaptor... I checked into it myself. If you don't want to take a strap wrench to your gun you can send it to e-paintballoutlet and they will actually do it for you.
If you do it, let me know how it turns out... I want to do it too, but it's a pricey venture. The only 90 degree elbow is currently bundled with the PTP kit (agd doesn't make them anymore, in the process of updating) and the PTP warp kit costs 160-180. Couple that with a lowrise such as a demonic strangler or Voodoo and you are talking over 200 bucks for warp... Ill spend that money on paint or something.
Head Shot Mafia - Milwaukee, WI