revolving rifle
Just a note of caution, Maybe you already know this but in case you don't.
One of the main reasons that the revolving rifle never really caught on was due to the rather large flame blast from the cyl. gap being approx. 6 to 8 inches from your face.
I wouldn't shoot it without very good eye protection, and maybe a good hat, (Just to keep your hair from going up in smoke "LOL")