My Airsoft gun has a leak, what do I do? Most of CO2 leaks are caused by a detached, crushed or deformed O ring or the intake valve. They tend to break the seal between the CO2 canister and the actual CO2 or gas intake. This is usually caused by not using a silicone base oil on a regular basis. You can also verify and make sure the screw near the CO2 valve is tight and not damaged.
Goggles that fog up are caused by the difference in temperature from your body heat and the colder environment. Even though you're goggles can be fog resistant, they can still get foggy and ruin your game.