I've only had 4 guns I would consider lemons.
An RG 66 SA that hangs on my wall in a cowboy holster that hasn't made it around my waist in many a year. It can't hit nothing with normal ammo, but the wife used it on a few buzz worms with CCI shotshells.
A Charter Arms Explorer pistol which I think is still in a storage closet in Arizona. Traded a perfectly good little Pheonix HP22 for it, worst trade of my life. Thing never met an ammo it liked, or a target it could hit.
S&W Sigma 380, don't even ask about all of it's problems. Sold it to a guy after the 12th time he begged me for it. Took 50 bucks for it, would have taken a can of soup and half a sandwich and considered it a good trade.
And then, not a pistol but still a lemon, A New England Handi-rifle in .223. Never could get groups smaller than around 3MOA. Sold it to a fella who said that was just fine, he just needed something to get rid of the dogs that were chasing his cattle thru fences but managing to stay out of the range of his shotgun. Got $100 for it and a scope, I was happy, he was happy, and last time I checked with him, cows were happy.