the build and quality on HPA systems is by far much more sturdy and much more safe then co2 tanks. Co2 valves are brass, brass corrodes, is a fairly weak metal. It also has pretty short threads on it, as where regs are made of aluminum or steel, or both. Most have atleast 3/4" of threads and are much thicker threads and thread shafts to prevent the tank from failure. However as said the gun is great on co2, so if its a better choice for you to use then have at it.
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