not really, the co2 will ruin a lot of solenoids in electronic markers. I know for a fact you can not use co2 in any type of automag RT. The valve cycles too fast and the liquid will destroy the valve no matter how many regulators and stabilizers you have on it. Its becomes a liquid when its in the valve again.
Dangerous Power makes an E1 that I have heard good things about, but I have never shot one. If you are willing to buy used, there are many more guns you could look at. A couple that come to mind that I have owned that I really liked are the Mini or G3.
It makes the biggest difference if there is something blocking the barrel. i.e. when I dry fire my gun I don't want to piss off the neighbors so I put a battle swab in the barrel. When I do this I notice most of the air and sound goes up through the feedneck. So I have a hopper I stuffed with foam, and when I'm dry firing I put the swab in the barrel and foam filled hopper in the feedneck, the sound is cut down drastically. This however does not work with poerfeed markers (too much noise escapes through the PF hole). Give it a shot if you you have pissy neighbors
Would you guys like to do some testing with a z-bodied mag? That might be a little more conclusive as to what is best over boring or under boring. At least you know with the mag the ball is getting the back spin for sure when it is shot.