Buys a very specific Taiwanese service rifle that has a number of unique details that sets it apart from generic BBwarz M4s.
Wants to convert it into a generic BBwarz M4-ish thing by removing some of the key components that make it unique.
Got it.....*sigh*
To answer your question - the gun appears to have standard threads for the barrel nut from looking at G&G's parts diagram. Who knows if the receiver rail will line up with whatever hand guard you want to fit. There will likely be some gaps at the front of the upper receiver because of the alignment notches for the standard hand guard attachment. All in all - it will probably look gash and ruin the gun's appearance, but hey ho, you'll be able to use it in CQB. It'll likely also be over-volumised because of the stock cylinder porting and shorter inner barrel.
But honestly - if you exclusively play CQB - you should have bought a more appropriate gun, price be damned. In an era where Double Eagle 904's can be had for £104 (current Patrolbase sale), buying a gun at a 'great price' and trying to convert it into something it wasn't intended for is a false economy. You will need to buy a new Inner barrel, Outer barrel and hand guard. Then hope it all fits.
Best of luck.