The Quick Change 12g CO2 Cylinder Adaptor uses a single 12g disposable cylinder. It comes with a standard thread adaptor that is compatible with the AG1 grenade charger and all standard paintball guns and markers. The 12g cylinder can put out about 20-30 charges and about 15-20 shots for paintball guns. T68 Gen5 Paintball gun with Quick Change 12g CO2 Cylinder Adapter Viewloader Paintball gun with Quick Change 12g CO2 Cylinder Adapter