You’re right. Rheinmetall (The creator of the MG34 and MG42) had already created a predecessor model in 1930, the MG30, but because of adherence to the Treaty of Versailles, the Weimar Reichswehr was unwilling and unable to adopt it. <br /><br />
Rheinmetall therefore sold the license to Solothurn in Switzerland, and Steyr in Austria, who adopted it into their armies.<br /><br />
When the NSDAP was voted into power, they introduced the MG30 as MG15/17 (to hide its modernity) in their fighter planes, and adopted Rheinmetall’s successor MG, the MG34 as the main Machine Gun of the Wehrmacht.