I think I’ve seen this picture before, but Wallphone sent it to me
Its actually on the VZ-61 wiki page. The Skorpion was designed to be a VERY small SMG that could be used as a carbine or as a pistol for Military and Police that might work in tight confines, like an armored car guard or a tanker.
This small size makes up for the fact that the Skorpion variants are in small calibers. The one in the photo is in 9×18 ( you can tell by the straight magazine) but most are in 7.65×17 Browning (AKA .32 ACP). Once you add all that crap to the gun, it really goes from neat, to silly awful fast!