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.
Cheap co2 tanks are about $20. Carbon air tanks go all the way up to $125 or so
size is all personal preference, you can get something as small as a 9oz or up to a 24oz co2 tank, the larger the tank is the more shots you will get off of it but the heavier and larger it will be
A fill station is a bulk CO2 tank, a fill hose and a scale. They are used by trained air smiths and paintball field employees to refill empty Co2 tanks. First the tanks are purged of all remaining Co2, then carefully refilled and weighed. If you are not trained on how to do this, do not attempt, at the risk of breaking the tanks burst disk or damage to you by the extremely cold gas.
A paintball gun needs CO2 (or HPA) to fire at all.
All paintball guns require propellant, but some use HPA or high pressure air, instead. HPA tanks are more expensive and holds less shots, but are significantly more consistent (accurate) and easier and cheaper to refill. You can also tell how much you have left on a HPA tank.
No. the only full air canisters are 12 gram CO2 cartridges, all others are sold empty under law.
Yes. All tanks and remotes have a standard ASA thread.
You can use co2 tanks if they are the anti-syphon tanks or if you put that on your tank put even then they are not recommended.
All Co2/HPA tanks will fit any marker. Co2 cartridges will not.
Yes. High pressure Air tanks (HPA) is compressed air, which is mostly Nitrogen. "Nitro" is not what HPA they are called, unless you are talking about Nitrous oxide, which is used in anesthetics and motor racing.
All Co2 tanks will fit any gun meant to be powered by Co2.