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Ya, TM V3/V3 mechboxes, but if it's a mechbox of another type (say an aftermarket reinforced one or something), it might not be shimmed properly, aka. too tight. I'd tend to trust that gear set in a stock TM gun, but don't like the fact it can't be shimmed for adjustment if used in another type of mechbox shell.
Open your mechbox, take out the cylinder, tappet plate, etc. then put a few screws in and snug them down, then spin your gears by pushing on the sector gear. If it doesn't turn easily and smoothly, then there is somethig wrong with the shimming of that gearset.
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