The ammunition used in airsoft are small little plastic balls called BB's. They come in different weights, sizes, materials and colours. They are usually composed of plastic, but they are also available with a biodegradable compound. Plastic BB's are often used indoors as for the Biodegradable BB's are used for outdoors. A good quality BB is perfectly round, smooth and consistent throughout each batch. Typically a brightly coloured BB is easier to trace than your typical airsoft BB's.
Try not to buy the very first gun you see right away. Check out reviews from different sources, ask questions, browse through a multitude of airsoft forums and sites, they will have some great suggestions on which guns to start with. If all else fails, our support team is also hear to help. However, airsoft communities have a great support system and getting to know what gun is right for you is easily attainable through some proper research.
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.