The "Wimmersperg Spz": https://en.wikipedia.org/wiki/Wimmersperg_Spz
I was not aware about this "assault rifle" at all, called a "Last Ditch Weapon".
Thanks for more information from the experts here in the forum...A "last ditch weapon" is a term used to describe cheaply-made firearms that are produced during wartime by a country or faction that is on the brink of defeat and no longer possesses the resources or facilities used to produce higher-quality arms.
Hans