On a paintball gun C02, or High pressure air is necessary. It is compressed air that, when the trigger is pulled and the marker fires, propels the paintball out of the barrel.
yes they are refillable
No paintball guns are waterproof, do not submerge them, even partially in water.
Nearly everything. Paintball guns are fired through the use of air or CO2. Also they shoot only paint. bb Guns shoot pellets, and look completely different then most paintball guns.
Where the air tank or co2 tank normally attaches
Co2 is carbon dioxide that is used for paintball guns
Yes, infact it is recommended.
It depends on the specific marker, pump has little to do with it.
drain the tank, throw it away
A paintball gun needs CO2 (or HPA) to fire at all.
you need Co2 to fire any paintball gun, it is what physically moves the ball out of the barrel.
Paintball guns can use Co2 from any company, they are all built the same. You can find valved tanks and 12 gram's at sporting stores, paintball fields and proshops.
Nitrogen systems allow your gun to use and process High Pressure air or Nitrogen. Many lower end guns only have CO2 regulators therefore cannot use High Pressure. If you do not have one, most likely your tank will leak from the gun, and it will not fire. Check the markers manual to see if you have one.