More and more CO2 guns are being produced because of the replica craze. Yet, many people don't know the basics of safely using CO2 and how to keep CO2 guns sealed. Don't be among the few who get a few hundred shots from a CO2 gun and then complain it's not sealed or all the gas leaks out. Let me take you through the steps of getting the most from your CO2 guns and cartridges. I also give you a quick look at the history of CO2 guns and the invention of the cartridges.