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That's 10 Mauser C96 handguns with 10 round clips welded together. They're chambered in 7.63mm Mauser, which is more powerful than 9mm but not at all a rifle round. I can't find anything about this online but would wager it was early war experimentation.
Quite similar to the Vilar Perosa - essentially 2 submachine guns strapped together: https://youtu.be/WLFA8VXVkRQ?si=Gv-yySX8nJeWF10o
Saw use by Italy on the ground and in planes I think.
I found a YouTube link in your comment. Here are links to the same video on alternative frontends that protect your privacy: