I'm the proud owner of, well, see below. I'd put up a piccy somewhere but Planet have their hands on it atm sorting out my air system.
You can get the Warp direct from AirGun Designs or AGD Europe and for IIRC £25 they'll put a microswitch behind the trigger to get it to run.
This is a totally pants solution IMHO so I did it a different way with the blade frame, if you want details drop me an e-mail.
Be aware though, it looks good but you may think it's a bit of a bodge to do and I think there will be a better solution somewhere out there, (I've got a few ideas on how to make it better already but I'm not prepared to spend cash on a new blade frame just to try them out), but mine works like an absolute dream and I've never had a feed problem, except when I've outshot the revy.
It is a lot of offside weight on your frame especially if you're running air on gun.
When I'm playing I've got the weight of the cocker, the warp, the full revy and a 1.9 Max Flo, and yes at the end of the day my arm hurts like hell
but it sure as hell is worth it.
Warp Feeds Rock