My thoughts were a G23 with 357 sig and 9mm conversion and a G21with 10mm conversion. And I would be able to shoot a variety of calibers on one platform. Muscle memory.
I've been kicking the idea around for a little while. A pistol that can be converted into multiple calibers. (I.E. glock .40 / M&P .40) As prepper related I feel that it would be extremely versatile. But I ask my self is it worth trying to stock up on multi calibers, cost effective or just...