Pretty much compatible across the board, but for their new pneumatic blowback enabled guns, you'll need to be able to do a bit of precision dremelling/drilling to put an extra hole in an aftermarket cylinder. Other than that knock yourself out.
A note though, these days most top level manufacturers don't need to have all the "guts" of a mechbox switched out, they pretty much all come with steel gears standard, high quality pistons etc.
G&G's QC lately has been hitting the toilet though so definitely a good idea to crack that gun open and take a look to make sure everything is kosher.
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