Shoot,
You can imagine how small the world can be! I was given a Kel-Tec P40 by a friend because he was fed up with the gun. Being as beggars can't be choosers, I accepted his generous offer.
I can see why he wanted to get rid of it. Uncomfortable trigger, hellacious recoil, magazines wouldn't feed correctly, etc.
Now, after 6 months of trying to get it to work, I decided to put it up for a consignment sale, 250 bucks,
with a list of all the known issues and problems. My dealer thought I was nuts, and so did I when it didn't sell for 3 months. One day, I got a phone call from the dealer who said that the gun had sold, to a Kel-Tec collector of all people (didn't know they existed). The dealer told me the buyer was astonished at the list of "issues" and then stated it was because I didn't know how to fire the gun (common viewpoint of KT P-40 owners). Whatever, I thought to myself, as long as the check clears. Well, low and behold, at a slow gunshow the following month, I ran into this guy who worked at booth next to me. He was Open Carrying his P-40, and I asked how he liked it. Said it was the best compact .40 S&W he had ever owned, that he had also bought it for a song, and then started in about how odd it was that the previous owner listed the faults and issues of the gun. He swore that he had no such issues with it. Thinking Deja Vu, I asked him what the SN started with. He pulled it out and let me look at it. Lo and behold, this was the SAME gun I had put on consignment. Seeing the look on my face, he asked what was up. I told him this used to be my P-40. We both had a laugh, and he stated that he was very happy with the gun and appreciated the honesty with the "list" that I had given, and that he hadn't experienced any of the problems I had. I ended up buying an older Smith M&P revolver off of him at that show and have been happy ever since.
Seriously, I have found that it pays dividends to be honest about the used guns that you are selling. List known issues, etc, or mention them. I have found that most people don't really care, or say "I can fix that". I also state that the price reflects the issues and won't really dicker with them. Sometimes it gets a sale, sometimes it doesn't.