What M4 body are you running it in? My last build with a KA M4 body wouldn't work right until I swapped all the internals into a Systema mechbox shell.
I'm testing out PP Torque Up gears...they're running really well so far. Smooth and quiet. Triggermaster III mosfet, 11.1v battery, PP Hard piston, random ventilated piston head. Guarder Infinite motor.
Trigger response is very good (attribute to motor/battery).
Don't ruin your build by compromising on the mechbox shell...
Best of luck,
Tys
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