Papasha is at 10:10 minute mark

where is PPSh41 Submachine Gun ....

Yeah, it's for the Deluxe version. And the campaigns have been rearranged so they play chronologically.

I know that Ultimate mod adds new weapons and textures, but it's a mod after all. This weapon showcase aims primarily at the vanilla weapons. Plus the mod should be for Deluxe version, which I can barely run on 5 FPS (I had tried everything to make it run smoothly, but it didn't want to)

Get the Ultimate Overhaul mod, and then recheck all the weapons. :)