Is it the AA sized small cell battery? They have pretty shit output.
As for double feeding, it's likely your hopup / gearbox nozzel connection, or the hop up rubber. Start by putting a couple of drops of 100% silicon oil in the loading hole of the hopup.
As for the half cocking, try a larger battery. The spring may be too hard for the small cell mini battery to pull.
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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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