Ah ok... so this changes things. The good thing is that you have both CO2 & Green Gas magazine options available to you. The downside is that (as far as I know) TM & WE mags will not work. They may fit but they are supposedly have different top ends and would likely just vent gas when fired in the other style of KJW.
Using EhobbyAsia as an example:
Green Gas mags for E2:
http://shop.ehobbyasia.com/kj-works-...l#.Vwe50NL2aAQ
CO2 mags for E2:
http://shop.ehobbyasia.com/kj-works-...l#.Vwe53NL2aAQ
Green Gas mags for older style KJW (TM compatible):
http://shop.ehobbyasia.com/kj-works-...l#.Vwe7GNL2aAQ