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från pyramidairs blogg:
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To really use air with the 850 AirMagnum, you need an AirSource adapter, a regulator (probably high flow), and an air tank. The tank stores the air up to 3000 PSI, the regulator reduces it to CO2 pressures and the adapter connects the whole mess to the gun. For the cost of this setup you might as well buy a PCP gun in the first place!
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