The fluid, high pressure co2 (or HPA) is let into the gun when the tank is screwed into the Air Source Adapter, it is then stored in the valve, until the valve is opened, then it pushes the paintball out of the barrel when it expands. At the same time, it resets the springs and mechanical components (specifics depend on the gun model) , as the valve shuts and the gun gets ready to fire again.
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