err for ion you want a Q-lock and on/off that about all that you need, but if you like putin alot on you gun you can get detents, grips, barrel, reg, trigger, bolt, fire chamber & donut, blackheart board and there prob a few things i missed out but only stuff needed is q-lock and on/off.
As for the egg the stock board should be fine but if you start geting performance upps then you may want to buy a Z board for it. (i no its some kind of letter mite b X
)
Air bottle seems fine.
Hope that helps