Nope. Leave it alone. Don't touch the gearbox until it breaks.
First (and most noticeable) upgrade -
SHS Hi-Torque motor
Second - 275mm ZCI barrel inner barrel
Third - Hop Rubber and Nub (the stock Raider G&G green rubber isn't bad at all, so I wouldn't worry for a while)
Run on a 7.4v Buffer Tube LiPo and you are good to go.