Airsoft guns are replicas of real firearms and use compressed air to fire plastic pellets. The spring-powered airsoft gun uses a compressed gas such as carbon dioxide (CO2), nitrogen or nitro methane to propel the pellet out of the barrel. This mechanism is called an internal combustion engine, which means it converts chemical energy into kinetic energy. The CO2 cylinder holds some 300-600 shots before needing to be replaced or refilled with more CO2. The same type of technology is used in pneumatic nail guns and paintball guns, but those devices typically use compressed air rather than the carbon dioxide used by most airsoft weapons.
Airsoft guns are powered by batteries that can range from 7 volts all the way up to 9v; however, it’s important for players not to mix battery types together in their guns because doing so may cause damage or injury during gameplay.