Ah, a vertical double barrel shotgun, or as I like to call it "Kick-back the Gun".

Loads shotgun with Malicious Intent

Over and under shotguns don't get the love they deserve in media, nice to see one here.

Stockless O/U, nice. Don't see that too often.

Now all she needs to do is lop about eight inches off the barrel end so she has a proper 'Devil's derringer.'