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check the tappet plate. had the exact same problem with a used ICS mp5sd5 (make and model really doens't matter here) and it was the tappet plate that was worn away such that the gear could not move it.
also of note, I do not know if the mechbox was molded wrong or the last ownr of the gun banged it and didn't relize it .. but there is a metal pin that is molded right to the mechbox that was bent between the trigger switch, gears, and tappet plate. this pin holds a spring. anyways this pin was bent such that the tappet plate would rub against it and i think this caused the tappet plate to missalign with the gear and cauase the wear.
i bent the pin back, replaced the tappet plate, now everythign is hunky dory.
bottom line is the tappet plate was jammped and the gear was jamed aginst the tappet plate and thus locked up the gearbox. might be worth your while to take it apart and check things out.
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