Quote Originally Posted by psychostorm
All good advice, duly noted. That would leave me with a bottle, buffer tank & an isolation valve that doesn't restrict flow to find.

All the paint ball bottles I find are pin valve but I read somewhere on here they can freeze open. Doesn't that make it unsuitable for use as an isolation valve?

Some people use paint ball bottles or similar but you will have to make up your own adapter to a standard CO2 nut for filling up at events.