It's always tough if you play on your own field with your friends, because once you run out of air, you're stuck. Not any longer!
You can purchase a bulk CO2 tank from any welding supply store. Once you've purchased the bulk tank and filled it, all you need to do is mount this fill station adapter to the top of it.
Simply screw the CO2 fill station onto your bulk tank and torque it down. Paintball CO2 tanks should only be filled by properly trained personnel, and it's important to have a scale, so you can accurately measure how full the CO2 tank is. You could blow the paintball CO2 tank's burst disk if you attempt to overfill it.
You can go down to your local field or paintball shop to learn how to properly paintball CO2 tanks. Be sure and practice to ensure you are confident and know what you're doing. Hustle Paintball takes no liability if you blow up your friend's tank.
The single-valve fill station is sufficient for most small groups of paintball players, but the dual-valve design releases the CO2 pressure without freezing your paintball tank's o-ring, so you may want to opt for the deluxe model even if you have a small group.
Depending on the size of tanks you're filling, a bulk CO2 tank will fill up to 30 paintball tanks (or even more!) A perfect investment for you and your paintball friends who have your own field or forest.