Propellant System
The tank holds compressed gas, which is used to propel the paintballs through the marker barrel. The tank is usually filled with carbon dioxide or compressed air. High Pressure Air (HPA) is also known as "nitrogen", as air is 78% nitrogen, or because these systems can be filled with industrial nitrogen. Due to the instabilities of carbon dioxide, HPA tanks are required for consistent velocity. Other propulsion methods include the combustion of small quantities of propane or electromechanically operated spring-plunger combinations similar to that used in an airsoft gun.
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