The prototype was used by the Norwegian Army fighting German forces in the Norwegian Campaign in 1940. This specific weapon was issued to Sergeant Håkon Lunde on 14 April 1940 when he was mobilized at Raufoss, and he carried it for several days before hiding it in Oslo. The gun remained hidden until the end of the Second World War in Europe in May 1945, when Lunde brought it back to his house and kept it.