Yes, MSPLD considers them all banned in this case. They don't care who shot robin or who's on first.
Correct. It’s a yes.
A copy is a copy. If the functional parts are all interchangeable than they are all the same in the eyes of MSP. So if a Soviet Dragunov uses the same dimensional parts as the Chinese one (I have no clue, I only know the broadest info on Dragunovs) then they are banned.