check your local laws, but you can buy a "black powder revolver" either online or from a sporting goods store. These are replicas of the old guns they used to use pre-1890, i think.

edit: these guns are not considered to be "firearms", as they do not use bullets that contain a blast cap or whatever you call it(i am not expert about guns).. i do think that you still need to be aware of concealed carry laws?

you can buy one of these and wont even need to show identification.

they look a bit tedious to reload, but after you load it you now have six shots, and if you have one on your left hip and another on your right, you would have twelve shots.

https://www.youtube.com/watch?v=dRcqKPzgHeE