If you meant "why do you need any gas tank for Paintball": the expanding c02 or hpa is what pushes the ball out of the barrel at high speeds and can be used in reseting the gun.
If you meant "why you need a C02 tank specifically":
you dont need a co2 tank to play paintball. their is compresed air tankes available. most electrical guns must run on air enless you want to be doing maintenance on the gun after every game and replace parts after 5 games. most non electrical guns also can be ran on air but is capable of runing on co2 but air would keep your gun in better condition.
You need co2 or compressed air(nitrogen and compressed air are the same thing) so the paintball can fly out of the barrel and to re cock your gun automatically.
No, any tank will work.
you need Co2 to fire any paintball gun, it is what physically moves the ball out of the barrel.
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.
No, paintball co2 is much higher pressure.
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.
Where the air tank or co2 tank normally attaches
Yes, every few games, you will have to refill the tank, depending on the size. Without it, there is nothing to propel the paintball.
There is no such thing as a "CA" tank.
18
No I went 4 hours straight on just a 9oz. tank
unscrew the tank, this will vent any co2 that is in the marker out the asa
You cannot unless you have a gauge installed, or know the exact weight of the tank.