Since they are battery powered, there are no CO2 fills required. Just plug the charger in your wall socket to shoot 1200 to 2400 rounds depending on the model. The ATS Paintball Guns are not exact replicas of real Guns as are the Airsoft models, but they do simulate firing a real Gun more realistically than the Airsofts. Muzzle Velocity of the Electric Guns is 250 to 330 fps. In general, the longer barreled guns attain a higher velocity and are more accurate at longer ranges.
Kits are available to increase velocity and power.
Some of the gas guns can attain velocities of over 600 fps. They look and feel identical to real firearms and are easy to maintain. All of the guns are clip fed. They will penetrate shipping box cardboard, but will not break glass at the lower velocities. The electric guns are a little less powerful than the low velocity BB guns, and are safer because the pellets are plastic and larger than BB's.