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It really depends on your gear choice and motor choice. Bushings/bearings hardly break once it gets pass the 6mm point. anyway, i would recommend a PDI 170% over the m120, but since you've already got it, i would recommend gears with a torqued rating. Is your piston half or full teeth? If it's half, get some 1st rating gears that is hellical. (Prometheus 1st torque rating is actually called "double torque" whereas it's standard ratio is called "torque-up") If it's full teeth, I think you'll be obligated to get some more expensive gears.
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