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seems to be very common with E1/KS p90s... It might be that the gearbox is just a tiny hair out of spec and isn't sealing properly when there is force from a full midcap pushing down on the nozzle. I fought the issue for 8 months before giving up. my CA gearbox works fine with the mags in the exact same body that the e1 gearbox was in.
I have now swapped out every single part from the bad gearbox into the good one and it has worked. I think I can safely say the e1/ks gearboxes are of slightly different spec.
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