I like to have access to and the ability to use ammo so I'm going to cheat:

G23 40SW, with a 9mm barrel/mags and 357 Sig barrel

4" .357 revolver for Mag's and Specials

22 lr, most likely the 3" LCRx revolver but a 22/45 Lite would be ok...the LCRx is just so handy, light, accurate enough, and likely to be less ammo specific on function than an auto.


Although I only have one specific use for it, and really don't care for it much aside from that use, the S&W Gov gives you the ability to use 45ACP, 45 Colt, .410's....so it's an honorable mention.