They need the small sealed CO2 cartridges, not the screw on tanks. but yes they need Co2 to function.
One can get paintball pistols serviced on eBay and Amazon. Amazon has over a thousand paintball pistols for sale, but eBay has the cheapest pistols on the market.
Anywhere from 18 to 35 shots is normal on most paintball pistols.
A paintball gun needs CO2 (or HPA) to fire at all.
No, they must be filled (and not with air). The only exception is the silver 12 gram cartridges for pistols and stock class guns.
I'm going to include paintball rifles in this answer. The cost of paintball rifles can exceed $500, but your question only refers to C02 powerplants. So in this answer paintball generally out cost regular C02 pistols and rifles. Now if you include all power plants like Pump, spring and PCP. (Precharged Pneumatic) air weapons then Pellet pistols out cost Paintball. As for the sport itself, with the cost of protection gear and the cost of gaming in general, then Paintball out cost regular C02 in general. But remember paintball is a competitive sport where teams compete against each other and shoot each other. Pellet shooting is a target and hunting sport, they are two very different sports and really should not be compared. Getting shot with a paintball won't kill you, getting shot with a pellet can kill you.
No, paintball co2 is much higher pressure.
No. Paintball pistols cost as much, if not more as starter guns. besides that, they have low ball capacity and must change clips after they run out of 10 balls or so. Also they run on 12 gram co2, which is expensive to run as a main marker.
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.
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.
call a paintball company and they can custome make one(most companys wil but not all)
A Co2 gun can go up to 300 fps. Sling shoots only get a paintball up to 240.