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120s.. thatll get you in the 420-430fps range with .20s
if you are not running with torque-up gears you will run into problems.
hell, i ran into problems using systema's infinity helical gears. the half tooth piston kept eating itself up on a 170% top power spring.
so i downgraded to a 150% PDI and it helped.
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"SI VIS PACEM, PARA BELLUM"
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