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Is you gun CA or TM? the prowin metal hopup for the CA is jsut trouble yet i have no idea how the TM version is.
A piston depends on your gears as stated and if you are going to get torque gears they will slow down your ROF, so a full set of teeth will be needed.
plus torque up gears are good for your pistons life FYI! so if you want to invest in a quality piston go for it.
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