I do like old guns and some of them are just fascinating.
LeMat: Cap and Ball revolver with 9 shots in the cylinder and a single shotgun barrel in the middle of the cylinder. It had a lot of firepower compared to the other guns of that time and suprisingly it has gained some fame in movies and games as well.
And things like these are just weird and cool:
"I am going to shoot you in the face and you will be the lucky one since your buddies get hacked to bits with an axe."
And can't forget Howdah pistols:
That's right, that isn't a sawed off shotgun. It is a twin barreled pistol chambered in .577. The name comes from the fact that they were originally used by tiger hunters that were riding on elephants (Howdah is the seat/carriage on top of an elephant.) Those guns were a backup gun in case the tiger decided to be unsporting and try to attack the hunter (Such arrogance, those filthy animals truly have no respect for the laws of God or men.) in self defense and climb up the howdah.
(Those were also used by British officers who didn't trust their revolvers to be powerful enough and I plan to get one for my character ASAP if a certain steampunk rpg gets started.)