Airsoft Guns

The guns used in airsoft are typically replicas of real firearms. Airsoft guns can be divided into three groups by what powers them: spring powered, electric powered, and gas-powered.

Spring Powered

Spring-powered airsoft guns (often called "springers" or "spring guns") are single-shot devices that use potential energy stored in a spring to launch an airsoft pellet down the barrel of the gun. The user must cock a spring gun prior to each shot much like you would a real shotgun or bolt-action rifle. This is typically achieved by pulling back the slide (pistols) or bolt (rifles), which in turn compresses the spring and makes the gun ready to fire. Because of this these guns are incapable of automatic or semi-automatic fire.

While most electric guns also use springs for this they are not considered to be in the same category as the single-shot spring-powered guns. Low-end spring guns tend to be much cheaper than their electric-powered equivalents due to their simplicity and cost of components (spring assembly , electric motor, battery, and battery charger) and thus are widely available. These guns are less suited for competition because they are at a disadvantage against automatic guns in close combat and don't provide enough accuracy and power for long-range uses. Higher-end spring-powered airsoft rifles can be quite expensive; these guns are typically suited for "marksman" applications in airsoft matches and can provide competitive muzzle velocities.

Gas Powered

Gas-powered airsoft guns use pressurised gas to propel pellets. These guns are capable of automatic and semi-automatic operation. The most common gases used are propane (usually referred to as "green gas" by airsoft players) and HFC134a refrigerant. Less commonly used gases include CO2 and nitrogen.

Gas power tends to be used in airsoft pistols where size constraints make electric-powered mechanisms impractical. Other instances where gas is favoured are where adjustable velocities are required or where a blow-back feature is desired. A blow-back feature is a mechanism which cycles a slide or bolt to better simulate a real firearm's operation. Because of the mechanical complexities involved with distributing and regulating gas these guns have largely given way to electric guns for less specialised applications.

Electric Powered

Electric-powered airsoft guns typically use a bank of rechargeable batteries to drive an electric motor, which cycles an internal piston/spring assembly in order to launch pellets. Automatic and semi-automatic operation is possible which gives these guns the popular name "automatic electric guns" or AEGs. These guns often attain muzzle velocities of 200 to 300 feet per second (60 to 90 m/s) and fire rates of 300 to 700 rounds per minute and are by far the most common and widely available airsoft guns in serious competition use today.

These guns were originally developed in Ja...