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Just install a new piston head. Stock piston head sucks and lets too much gas past. I use a Dyna one. Just make sure you keep the thicker o-ring lubed or else the piston will eventually dislodge it and then you'll have to take it all apart to put it back in place.
New piston head will let you get 25-35 shots on a single gas charge depending on rate of fire and ambient temperature.
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