The 9x25 mm Danuvia submachine guns (Király géppisztoly) were designed by Hungarian engineer Pál Király in the late 1930s. They were issued to Hungarian army troops in 1939 and remained in service throughout World War II. A total of roughly 8,000 were made between 1939 and 1945. The Danuvia was a large, sturdy weapon, similar to a carbine. Although inspired by the 9x19mm Parabellum Beretta Model 38/42, the Danuvia used the more powerful 9 mm Mauser round. Like the Beretta, the Danuvia's magazine can be folded forward into a recess in the stock where a plate then slides over it.