[mcguyver]

One thing to remember Illusion is that G&G mechboxes have the screws on the opposite side to a Marui and every other manufacturer. When you open up a Marui box, the screws are on top when the nozzle faces you right hand and the motor pinion entry is facing your body. G&G screws are on the other side.

Now imagine trying to assemble them with the arrangement this way. You have to assemble the halves then flip the mechbox over to put the screws in it. Very old G&G may not be this way, but all the post-2005 I've opened have been this way.

And the post-2005 G&G replacement mechboxes don't fit in pre-2005 guns. The selectors don't line up and you have a bitch of a time squeezing it in there.

I don't miss working on G&G guns at all.

I doubt ICS will work in there as G&G bodies don't use ICS AR release, the selectors are different profiles, the ICS upper can't have a stock screw run through the spring guide and likely many more issues that don't make the idea worthwhile.

I also tried a Systema M120 complete mechbox in a pre-2005 G&G gun and it wouldn't fit without some Dremel work, and I wasn't in the mood for that crap, but it fit an old CA metal body no problem.