What are the guns that you regret letting get away for whatever reason?
I let many go starting around 2005 cause life happened.
I had to sell a Marlin 1894CS in 357 magnum which kills me to this day. If I knew it would be so hard to replace, and so expensive now, I'd have hung on to it.
Another related thread would be guns that you regretted selling enough so that you later replaced them. In my case that would be the aforementioned Thompson, and an original Winchester BAR. I eventually replaced the BAR with not one, but two, Ohio Ordnance M1918A3 semiautomatics. The Thompson? Again, replaced with not one, but two, Richardson "80%" receivers, completed with Russian reimport parts kits. They are "dummy" (display) guns now, but they could be made into working guns if the law ever changes. (I'm not going to pay the artificially inflated $20 - 30,000 for full automatics.). I missed that one enough that I bought another when it crossed my path.
Sold one for $900 a few years ago. I cringe when I think what it would sell for today. Not sorry I sold it, but it was poor timing.45 Colt Anaconda
Gave away my subcompact XD .40 to my nephew. I did not miss a subcompact .40, but I did miss the platform, and ended up buying a 4.5" XDm 9MM.guns that you regretted selling enough so that you later replaced them