I'd recommend u switch over to a prowin gearbox for high FPS and high ROF
I'd also recommend u get Helical gears instead of standard flat gears, since a standard ratio helicals will produce a much higher ROF and be able to pull back a much stiffer spring, they just take a little longer to shim
Also with a magnum motor, I think u should just keep it the way it is, since I found the guarder ones to be weaker, If u really need to upgrade the pinion gear I recommend u get the upgraded one by systema for Magnum and Turbo motors.
Lastly, I highly recommend the Sorbo dampener, I've build a rifle for a customer with 410fps and 28-30 BB/Sec on a stock TM gearbox and it doesnt even look like it has any sign that its gonna break soon.
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