I regret just about every sale or trade I've ever made. My first Single Six, my first Mark 1, my first .357, my first .45, my second .45, the list goes on and on. I have my collection split in two now, I have a core collection that will never be sold or traded and then I have a secondary collection that I buy guns I want to play with. Once a gun is added to my core collection then it's a done deal and I don't even consider selling it.