There is a SIGMA AV-2001 Supergun on eBay... How hard it is to find the JAMMA & AV cables and the joystick? This kid is lucky to have the complete set :->
Ahh, the seller is near you too. the pinout info is here if you are inclined to build your own: http://www37.atwiki.jp/pm-service/pages/14.html Sorry I can't help more, but I see the auction is ending soon, so I hope this is better than nothing!
Doing your own supergun is not a science the only expensive part is the video encoder if your not going the RGB way. But the built is very straight forward.
