Spring Powered Airsoft Rifles are single-shot devices that use potential energy stored in a Spring to launch an Airsoft Pellet down the Barrel of the Rifle. You must cock a Spring Rifle prior to each shot much like you would a real Shotgun or bolt-action Rifle. This is typically achieved by pulling back the bolt, which in turn compresses the Spring and makes the Airsoft Rifle ready to fire. Because of this, these Airsoft Guns are incapable of Automatic or Semi-Automatic fire.