Yes Compatability is key! Expecially for the pistol grip! I cant find any! The Damn hopup unit is a freakin pain in the neck, they only allow ICS hopup nubs all the other nubs are too big for it.
The Long piece of metal that holds the wire down in the mag well for the retractable stock is also a pain. They need to change that concept. It is very hard to insert the screws. Now its stripped because of that stupid concept.
Oh and the Colours I hate the colour. Black would be the best I spent alot of my time stripping the gun down and painting the damn thing (just thinking about all that time i spent painting pisses me off). If they change everything that was listed here and above i might go back to ICS.
IF they dont Classic Army or G&P all the way.