No, any tank will work.
unscrew the tank, this will vent any co2 that is in the marker out the asa
No, paintball co2 is much higher pressure.
Dicks, any paintball shop, and Gander Mt.
you need Co2 to fire any paintball gun, it is what physically moves the ball out of the barrel.
No paintball gun will work without a CO2 tank or other propellant tank. without Co2 there is nothing to push the ball out of the barrel.
Yes, every few games, you will have to refill the tank, depending on the size. Without it, there is nothing to propel the paintball.
Where the air tank or co2 tank normally attaches
If it has threads on the top, you refill it like any other tank by taking it to a sporting goods store or paintball field. If it does not, then it is a disposable, and you cannot refill it.
There is no such thing as a "CA" tank.
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CO2, stored in the tank is highly pressurized. The paintball being shot is caused by it being pushed out by the rapidly expanding gas. CO2 also cycles and reloads the next paintball.