It looks like the back of a bolt action merged with the front of a semi-auto. What the fuck is this thing

EDIT: there aren't many rifles that do bolt-action and semi auto, but some of them do. If that's a real gun, then that narrows it down tremendously.

It's at this timestamp in the video, no additional angles, but you do get to see that the bolt opens straight up 90°, and also there's a flash hider. I think this is a drama that takes place in east germany? That narrows it down too.

The front sight really reminds me of an SKS, except not... It's like an 8-shaped peice with three holes that do front sight, barrel, and gas tube.

The rear sight looks like nothing i've ever seen. Doesn't look like the leaf rear sight that i associate with bolties.

The tube under the barrel is not bayonette storage because there's a weird plug at the end of it, it looks like you could rotate it and disassemble the tube.

Regardless if it's a real gun or not, the fact is that someone made this at some point, and i can't guess why they did it this way lol