This weapon has an odd history; it is reputed to have been a French design, stolen by a glamorous female spy, which then passed to a Swiss company, who had the weapons made in Spain in the 1950s.
The Swiss went bankrupt in 1957, the Spanish factory took over the guns, and where they went after that is anybody's guess. A number were either made, modified or refurbished in Turkey in the late 1960s and used by the Turkish army for some years. I
t has a somewhat complicated mechanism, which was one reason for the lack of military interest in the original design, but seems to be found with a wooden butt or with a folding butt.
Just as some of Mauser’s technicians went to Spain after World War 2, some went to Switzerland.
Some of those technicians went to work for SiG, and they took the plans they had for the StG-
One of the unique features of the Stgw-
STURMGEWEHR MODELL 510 (STGW 57)