A Luger with a drum mag? That would be easy I suppose as we already have the Luger model.
Yes, that would be easy to do. (Though it might require new animations...)
Now if you want to turn that into a good suggestion, you also have to include when it was used, how it was used, how common it was, ideally what maps it could be put on (which kits?) and of course reference material for modellers (i.e. pictures of the thing).
Was not used at all in WW2 (lugar with snail drum I mean).
As for nagant revolver, isn't that already in FH2?
Also, god damn kratzer, that is a thing of beauty.