Faster ROF ? Easiest way is to get a higher voltage battery. IE, if you have a 8.4v, then a 9.6v will make it run faster. A high speed motor is another option, as the high speed gears, but these are for 330 and lower fps, otherwise you'll have trouble in the gearbox.
As for the FPS, the main thing is the spring. Changing the piston head will mostly give you more consistency on the FPS variations, from 10fps stock let's say, to 3-4 fps variations from shot to shot. The FPS is really determined by the speed inducted to the piston, so the spring is THE part to swap to change the FPS.
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