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It seems that you are using standard ratio gears.
You shoud use high speed gears.
In my m4 i use this setup
Sp 90
modify high speed gears
Motor G&P m 120 high speed
Modify piston
Modify piston head
Metal bushing
All that running on a 8.4volts 1100mah batt.
I dont know the BPS but i was matching up with my freind m4. he was running on a 9.6 v bat, Magnum motor, etc.
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