Single shot air pistols

 

— a weapon that can hold only one bullet or ball. The advantages of this design are simplicity, reliability, compactness, low cost, as well as a minimum of parts moving at the time of the shot, which has a positive effect on accuracy. On the other hand, the need to reload after each shot creates certain inconveniences and reduces the practical rate of fire. Therefore, such a design is rare, and in specific types of pneumatics — multi-compression models (to reduce cost), spring-piston models (for the same purpose, and also due to the use of fractured barrels in such weapons), as well as professional PCP pistols (where the minimum of concussions and the maximum accuracy of each shot is more important than the practical rate of fire). But in principle, it makes no sense to make gas-balloon pneumatics single-shot; revolvers are not like that at all, by definition.