Hi

My recommendations is that you use air, which is what it is designed for. I have seen in other forums of people with serious burns and airguns explode by introducing different gases into the airgun. 

Regards 

Enkey


The examples you see with burns/explosions are when people use compressed oxygen (O2) in their airguns. This is definitely a no-no.

Technically, CO2 should be ok assuming you were able to get it at the required pressures. However, I would choose N2 over CO2.