I don't even remember this happening, so I'm taking my dad's word for it:
Around 17 or 18 or so, dad gave away most of his shotguns / rifles because he didn't hunt anymore. All of the kids got one. Apparently I received some sort of 20 gauge shotgun and promptly sold it to one of my brothers
I was probably concerned with buying a new guitar instead of having a shotgun.
Like I said, I have absolutely no recollection of selling the shotgun. One day when I'm at my brother's house I'll have to investigate exactly what I let go. Maybe he'll consider selling it back to me some day.....