The Danuvia 39M/43M was a Hungarian submachine gun designed by Pál Király in the late 1930s. It had seen major conflicts during World War II and the Hungarian Revolution. Unlike most SMGs, it fires the more-powerful, rarer 9×25mm Mauser round instead of 9×19mm Parabellum. The gun was well-liked by troops it was issued to; it reportedly functioned well in the sub-zero, muddy conditions on the Eastern Front.