In 1916, Heinrich Senn of Bern
designed a modification of the standard Swiss Luger pistol to fire in
single shots or in full-automatic. This was achieved through the
implementation of a sloped trigger sear which allowed the breech block
to pass over it uninterrupted when the trigger was held down. When the
trigger was released, the sear would rise and catch the breech block.
This system was the subject of German patent DE310499 of 1916 and it was
tested by the Swiss Army during World War I. Georg Luger himself
apparently demonstrated a similar Luger machine-pistol before the
Prussian Rifle Testing Commission around the same time, which inspired
the German Army to introduce a submachine gun into service. The Senn
machine-pistol was, however, not successful in and of itself and it was
never adopted by any military.
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