I remember the Ruger Blackhawks with swapable cylinders for .357 and 9mm, but hadn’t given it a thought on anything else. Well not sleeping and being bored, I come across this, https://www.tkcustom.com/services/machining I think their prices are a bit steep, but it’s an interesting idea and makes a gun even more versatile imo. I’m not sure I’d want to carry moon clips 100% of the time, but in an instance where you are out of ammo and some 9mm happens to be available, you could keep going.
I dunno, I found it an interesting idea, thoughts?