The Tiny Praga Model 1921 pistol, Produced by the Czech company Praga Zbrojovka. one of the smallest common semi automatic pocket pistols ever produced. To make it even smaller, the Model 1921 featured a folding trigger rather than a trigger guard. One other interesting feature was an indentation machined on the slide. The purpose of this was so that the user could work the slide with the use of his or her index finger.