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+1 to what RainyEyes said.
I know the G&G mp5 quite well actually. And a regular gearbox shell will work in it. (I fitted a G&P one in mine a few months back) However, to do so, you'll have to mill the top 5mm ridge off the gearbox for it to fit in the G&G body.
Other than that, selector, nozzle, and hopup unit are all proprietary. You can still fit one of those purple alu nozzles in it, from SHS/Ace1arms though. but you'll need to grind down the tappet plate front to properly match/seal it to the hop up unit.
Also, G&G discontinued support for their mp5s, so no luck getting parrts directly from them....
If I was you, I would get a old cansoft G&G mp5, and put the body on it. Cheapest way to get it running imo.
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