Just for fun I decided to write up a gunblade for use in OSR/SWORDDREAM style tabletop RPGs. Initially I thought it would be pretty simple, just a regular sword with bonus damage. But after looking into the new Gunbreaker class in Final Fantasy XIV, I realized through specialized ammunition it could be much more interesting.
The rules below are mostly system neutral (leaning towards Knave.) I’m sure it will not be difficult to adjust things to fit into your game.