This just sounds like crazy talk. 
Norway - to be able to own a gun that is not meant for hunting, you need to get e permit for that weapon and dyou need to be an active member of a shooting club, if not - you do not have a reason to own such a gun. And I think this is mostly pistols and small firearms, nothing too crazy. Nothing automated.

Now if you actually get a permit is not a given, they can just say «sorry but we don’t like your face». 

 You should see my collection. Small but functional 


And I make role and pistol ammo too