There are two in particular I wish I didn't sell.
My Taurus 82 was my first handgun and I sold it after 6-10 months. At the time I had this weird idea that I'd only own 2-4 handguns. I had just bought my S&W 65LS. Since I "knew" I'd only want a couple guns I didn't see the point of keeping two medium-frame revolvers, one .38 and one .357, they were just too similar. So, I stupidly sold my 100% reliable first handgun.'
The other is the CZ 40B that I sold. Great gun, but I wasn't a big fan of .40S&W at the time and the gun wasn't great for what I bought it for. I meant it to be my carry gun if I move or when visiting states where I could carry. While reasonably light (28oz) it is big and thick enough to be a bit too large to be quite right for carry (not bad, it would work, but not ideal). Meanwhile, it was light enough, and just short enough (4" barrel if I recall correctly) to not be a regular full-size and have a slight disadvantage at the range. It just was an in-between size that wasn't perfect enough. Still, it was good at the range and it would be decent for carry, and it was accurate and quite reliable so it was a dumb move. Now, to replace it I've seen used 40Bs go for 50-70% more than what I sold it for :banghead: