Install a MOSFET switch and upgrade your wiring. It'll be way easier on your trigger contacts, increase your ROF by an audible amount, and open the door for you to run a LiPo if you wanted to go in that direction.
As for internals, just get the mosfet going, shim your gears properly, put either guarder/systema/kanzen bushings or bearings in your mechbox and set your motor height properly.
Other than that, just run it till something breaks. Once the piston eventually strips, upgrade to a systema piston and possibly systema gears if it's in the budget. Either torque or standard ratio. No use going high speed unless you wanna be up at 1400rpm.
Honestly a JG is not one to do any $200+ upgrades to. It can be made to do what you want it to do, but don't sink too much money into it!
If you read reviews, I'm sure you already know, it's not a high performance tuner machine, just an entry level gun.
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