Glock M29 or 1911—both in 10mm
I nominate the stackbarrel DAVIS Derringer in .22WMR that I bought and when I went to fire it, the safey mechanism literally FELL OUT of the firearm. I sold it instantly, without squeezing round #1 through it. I'd favor a Bond Arms if I were going back to that BUG concept. Prolly in a .45LC/.410 configuration.