well if your field doesn't have air fills, it isn't really worth it to get HPA unless you get multiple tanks which get VERY expensive. or you could get a SCUBA tank and fill off of that, but the pressure drops after every refill.

you can fill a HPA tank off the cascade if you have a special fitting which is hard to come by. i have an adapter that you hook up to a scottpack, they are expensive and hard to find tho.

i would suggest you getting a PPS stabilizer and use the co2.

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