I searched but I didn't find this topic, so if it has been beat to death please forgive me.

As I troll through the "for sale" forum, I am reminded of the pre-ban Chinese underfolder AK-47 that I sold. I sold it to my buddy for a good hunk of change. A year or so after I sold it to him, I offered to buy it back. He got into some financial trouble and sold it on-line to someone. To this day, I regret selling that firearm.

What do you regret selling? Firearm or something else?