If you're using a 9.6 large battery (or equivalent) there may be too much power for the cut off lever to activate before the gears have enough time to half cock the gun. This isn't necessarily a "problem" with your mechbox, but rather a kink in the setup you're using. Try shooting with a weaker battery (8.4 mini or 8.4 large) and see where your piston lands. Otherwise it could be a sticky cutoff lever. Just my thoughts.
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Ár skal r?*sa, sá er annars vill
fé eða fjör hafa. Sjaldan liggjandi úlfur
lær um getur né sofandi maður sigur.
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