Great question...slightly misplaced period. Not that you're wrong, but nowadays even Topolino is censoring or downright deleting firearms. A rather infamous story has been published some months ago that involves Goofy taken hostage by a bandit and Chief o'Hara rescuing him. Not a single firearms is present. Results: a bunch of people waving their fists menacingly. Only characters like Scrooge or...we call him Dinamite Bla, I don't know the original name...use old blunderbusses loaded with salt. Even Donald stopped using his sport shotgun a lot of time ago.
So, if you see a firearms in a Topolino's story, it's possible that story is some years old.