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Co2 is a liquid that turns into a gas, and n2/hpa(goes by both names) is a gas all the time. HPA is a much more stable system, and I would definitely suggest it. Most fields that are speedball courses will have HPA, and some woodsball places too. If you're going to get one, get a High pressure tank, as almost all guns on the market will run well off of High Pressure.
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