the quantum piston is _supposed_ to work with full tooth gears.
are your guide rails smooth (enough)? ...if things are a little rough use some lube (that's what she said).
I've seen (although my google-fu is failing me atm) some v3 users glue a spacer to the top/back (open side) of their piston to stop it from binding.
G&P m120's aren't the torque-yst motors around. if you have something else on hand, give it a go (although that lipo probably fixes that).
you could probably just bring it to a tech nearby, if not just for a fresh set of eyes.
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too busy tinkering to play.
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