I wouldn't suggest Prometheus double torque gears Namloot. They're the equivalent to mere Systema torque gears (one level above standard ratio), and are not recommended for a M150 spring. You would be fine if you're the type that only takes a shot every now and then, but if you have a chance to fire multiple semi-auto shots in a short duration of time your motor is going to heat up extremely fast because of that mismatched gear ratio.
You also really need triple torque/super torque at a minimum and a higher than 9.6v battery to get a decent trigger response at 500 FPS.
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