a HPA tank, every marker currently produced (and every marker that has been produced for a LONG time) that will work on CO2 will also be fine on HPA. the output pressure of a standard high pressure HPA tank is around 750-800 psi, and the output on your co2 tank is right around 800 so it is a direct swap, id recomend getting a 68/4500 HPA tank, it will give you about the same amount of shots as a 20oz CO2
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