An air gun is any kind of gun that launches projectiles pneumatically with compressed air or other gases that are pressurized mechanically without involving any chemical reactions, in contrast to a firearm, which relies on an exothermic chemical oxidation (deflagration) of combustible propellants to generate propulsive energy. Air guns, traditionally regarded as guns for beginners, have now made the transition to guns for everyone. Some types, such as the familiar BB gun, are excellent as a “first gun;” other types are designed and used by seasoned international competitors. Whether they are used for recreation or sport, for field use or as an inexpensive training tool, air rifles and air pistols are an excellent way to enjoy shooting. Smallbore rifle competitions are one type of air rifle of interest to enthusiasts. The first air guns were developed as early as the 1500s. They have been used in hunting, sporting and warfare. Modern air guns use one of three types of power source depending on the design: spring-piston, pneumatic, and bottled compressed gas (most commonly carbon dioxide).