How to upgrade the stock of the G&G GC7A1?

[MacCraw]

I know a lot of true Canadians (I'm American, I apologize, but I want to sort of imitate the Canadian military) will hate me for this, but I'm considering buying the somewhat infamous G&G GC7A1, which I know a lot of people say isn't a TRUE C7; I understand, but to each their own. I just want a gun that feels like a C7, but more specifically an A2, and the GC7A1 has a fixed stock.

Therefore my two questions are, is it possible to change the stock on this to a retractable stock, and also, where's the battery housed? Handguard or stock?

On the note of the stock, if it is retractable, can I get a parts list from sellers in the US, like Evike or Airsoft GI? I'd really appreciate some (polite) help because I just personally don't know a whole lot about airsoft and customizing guns, so any help would be appreciated.

[cetane]

Battery should be in the stock. You can remove the stock and install pretty much any aeg buffer tube & receiver end plate. You may need to trim the extension off the receiver shorter, but it’s not hard.

[MacCraw]

Which ones though? I know what the parts are but I need to know which ones would be best.