That statement isnt true. You should get more shots out of a CO2 of the same size as an HPA tank due to the nature of how it is stored in the tank. Just because HPA is stored at a higher pressure, doesnt mean you get more shots. CO2 is stored in a liquid state, allowing you to hold more potential ga...

Have you tried using a high flow low pressure output paintball regulator. they use 1/8" NPT fittings, but you can use simple adapters to use. This will allow you to use a CO2 and or HPA tank. Or, i know home depot and lowes sells a portable kit that allows you to use a co2 tank to run air tools with...