It's an awesome mech marker, yes the body is removable, Ion triggers won't fit but some Ion bolts will fit - provided they have dual tail o-rings. Bolts with single tail o-rings will fit but your velocity and efficiency will be all over the show as it won't be able to seal the dump chamber when firing.
I'm a massive Automag fan and while the enmey doesn't remotely compare in terms of build quality, I actually prefer the way it shoots. Plus it's a hell of a lot lighter than a mag.