CO2 pistols function like air rifles, again propelling projectiles with pre-compressed air. However, while many air rifles work with a spring pressure accumulator, most CO2 pistols have cartridges or compressed air tanks.
Competition pistols are powered only by compressed air, and diabolos with a diameter of 4.5 mm and weighing about 0.5 g serve as ammunition. While recreational pistols are available for as little as 100 euros, high-precision competition pistols can cost several thousand euros.
From a legal point of view, CO2 pistols with the marking "F in a pentagon" and the designation E0 < 7.5 J can be sold without a purchase authorization, just like air rifles. Outside of the own pacified possession or the shooting range a carrying is permitted only with a weapon license.