i think you can use any non lvl 10/x valve autmags with co2, not sure tho, if you want a good mag, you will need compressed air. Best place to buy them is really
www.airgun.com direct from them. As far as mech goes, get a rt pro or whatever, get ule body, intelliframe, and lvl 10/x-valve, and you should have a good mech mag, and when the deadly hairwind comes out, and if you slap one of those on, you will have an awsome mother of all mechs