Air pistols are using spring piston and the piston is closed with nitrogen at the edge of a flange bearing. These guns arm by breaking the barrel and anchor the piston in the mechanism of the trigger. By pressing the trigger is released the spring or nitrogen piston compresses the air inside the casing, giving energy to the bullet fired. The hand airguns of the spring, because of their small volume, it is not possible to give us high speeds, nor can be iteratively, and the nitrogen to give the piston almost double speeds. The spring having a good shot around 10 meters, while those with the nitrogen piston most bigger and is completely autonomous.