Found this image of this Assault Rifle and LMG shown in the National Museum Of Military History but have no info on the display. Does anyone here know about it?
It looks like the LMG present may be a Spasov M1931/1938. The video you provided shows that one of them is marked as being produced in September of 1944 so this is certainly the right time period.
The assault rifle looks like they are playing around with a Simonov inspired rifle that could be produced cheaply with inexpensive bent sheet metal. I have yet to be able to find a name or ID for it, although much of that display looks like it demonstrates the works of Spasov as a firearms designer so that may be a start.
