If you want more power, start at the heart. Apply torque to the gear set before you consider doing the motor.
Doing it the other way around not only increases stress dramatically to your gears, but also drastically increases the risk of stripping gear/piston teeth due to torque build-up. Unfortunately, this is the same mistake that the majority of airsofters out there make, by upgrading the motor without considering the gears.
It's somewhat akin to slapping in a high power motor in to the car without taking in to any consideration the transmission and gear ratios.
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