It was one of submachine gun candidates for Swiss Army during World War II, but was not chosen.
At the onset of World War II, Switzerland had declared neutrality in the fast-escalating conflict.
The prospect of potential invasion by Nazi Germany was a real possibility and in preparation for such scenario, the Kriegs Technisch Amt, sent out an ordnance survey to Swiss Army in May 1940.
[1][2] Upon reviewing the results, the outfit found that the Swiss Army had fewer than 500 submachine guns at their disposal and the matter needed to be rectified urgently.
In 1941, the submachine gun trials were held and SIG submitted a batch of 50 units for testing.