Isn't full auto banned at all sites and tournies etc. in both America and Europe? There are one or two guns out there that can be set to full auto (raceguns being one) but that is purely for piss about reasons in your back garden or something, NOT for shooting at people!
If you are using a rebel now and want to upgrade to a higher tournament marker then you want to look at impy's, cockers (both mechanical and electro), angels, shockers, matrix's timmy's etc. None of these are full auto but in the right hands they sure as hell sound like it coz they are capable of shooting as fast as your little fingers can pull that trigger.