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Gear timing is correct, new piston installed, using 9.6v NiCad battery, tested with both 330 fps and 400 fps uppers.
There's no visible stripping but there's no velocity in the bbs.
Air seal is perfect, hop-up is clean and clear, mags feed perfectly (tested those on my friends gun as well), tested with other mags. Bbs keep rolling out... I'm confused.
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