Automatic airsoft guns use a rechargeable battery to drive an electric motor, which cycles an internal piston/spring assembly in order to shoot
BBs or 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 500 fps. They are the most
preferred used and widely available type of airsoft gun.