Op43 12oz Co2 Alloy Cylinder OP43 $60.00 Default - $60.00 Quantity This product is currently out of stock. We may not keep this item in stock. Please fill in the form below and we will let you know availability! OP43 12oz Co2 CyllinderStandard cylinder for paintball guns that can operate on Co2Check out the new OP43 Paintball CO2 Tanks. They are available in 12oz . The are made of high quality aluminium cylinders with industry standard pin valves.