G&G TR16 R4 Upgrades?

Hi, I just got the TR16 R4 I was wondering if it was a good gun for a begginer and what upgrades there are for it, I don't know much but I do know my way around the gear box, I am looking for upgrades for FPS/ROF/accuracy I want to know if there are any internal upgrades for the gun thanks,

I switched to 11.1 LiPo and added a mosfet. This nearly doubled my ROF. It was measured around 22 rps. Not "great", but not terrible either. I think the piston was also replaced. I have the G&G M4. I have had it for over a year and it has been awesome. It shoots around 360 FPS, so it is gtg for indoor games.

Yeah I did a little research on it and it said a new stock motor is helpful increases the ROF and the FPS but right now my gun is shooting at around 24-25 RPS with a 9,6 volt battery I was thinking about getting the lipo but I heard it has to be in a bag?

My Combat Machine didn't come with rails, so the battery was kept inside the the forward hand grip like factory. I have ordered a PEQ-16 box for it since I now have rails. It never got hot and has lasted me a full day of airsoft. The motor however gets VERY hot. I now have a MAGPUL MIAD grip and my hands are happy.

Yeah I think I might just go get a new Stock motor and a piston and a new spring, Maybe a new longer barrel, and a lipo battery then my gun will be a amazing, now all I need to do is figure out how to put the pieces in!