Biggest mistake buying,
A Desert Eagle in .44 mag when they first came out. What a POS. Total jamm-a-matic. Sold it and bought a 629 DX.
Biggest mistake selling,
Whew, a 29 Smith, a 19 Smith, a 629 DX smith (yes, from above), a King's custom 1911, a Springfield 1911 customized by Frank Glenn..
There's probably more, just too depressing to think about.
I've replaced the 29 and the 19. NO WAY I'm going to make that mistake again. Still looking for a really nice Gold Cup 1911, and maybe another 629 DX.