Spring piston break barrel air pistols are beginner level air pistols. These are very easy to use and require minimum maintenance. These air pistols are great for Plinking and fun shooting. In a Spring piston air pistol you compress a spring behind a piston and attach it to a latching mechanism which is connected to the rifle's trigger. When you pull the trigger, you release the latch and allow the spring to push the piston forward. This compresses the air in front of it which has no place to go other than the air transfer port between the chamber and the pellet. The air then pushes the pellet forward out of the barrel to escape.