You must get them hydro tested every 5 years.
It depends on the material, but they must be retested after so many years (depending on tank) if they pass, they can keep being used.
A 12oz tank will not last long on any gun. Most likely, you may get 400. 500 if the dwell is low.
A compressed C02 tank or High Pressure Air tank propels the paintball.
Where the air tank or co2 tank normally attaches
your local paintball field. Or you can purchase a scuba tank and adapter to fill the paintball tank with and every once in a while fill the scuba tank up if you live like out in the middle of nowhere
NO the gases are different densities and the tanks are specifically made for that gas pressure. If you can afford a gun that needs compressed air then you can afford the tank too.
Take it to an airsmith or paintball tech.
Compressed air tanks were around long before paintball.
No.
No, paintball co2 is much higher pressure.
There is no such thing as a "CA" tank.
It depends which one. A stock Tippmann 98 with stock barrel and angled tank is about thirty inches across from barrel tip to where the tank would be.