I used to be a gun dealer so I took in mamy many rifles on trade. I can honestly say that I never came across any problem trade ins. Most just wanted a change or a bigger or smaller caliber. I am a little spooked of used revolvers but I really never had many problems with them either. I took in a lot of S&W revolvers that the timming was off on but had a good gunsmith working for me who could correct the problem pretty cheap. I did take in a shotgun once that had a bulge in the barrel about half way down.