A player who is marked is eliminated from the game. Paintball guns come in a variety of styles. Some are small stock pistols, powered by small 12-gram CO2 cartridges that need to be changed after 15 to 25 shots. Other paintball guns are rifle-like, with shoulder stocks and longer barrels. These are powered by larger, refillable CO2 cylinders that supply hundreds of shots.
Some paintball guns are pump-actions.
Each time you shoot, you must first cock the paintball gun by using a pump. Paintballs won't hit hard enough to cause an injury as long as proper safety procedures are followed. Protective covering with multiple layers of clothing is recommended. Barrel plugs are required anywhere off the playing field. Professional referees on the playing field control the games, enforce the rules of fair play, and monitor safety rules.