I have an Undercover .38 that I bought from an Air Force buddy in 1980. In the last 28 years, it's probably only fired about 1000 rounds, but then, it's a gun that you shoot for familiarity and not wear it out. Still and all, to this day, its lockup is tighter than any S&W J frame I've owned or inspected. When the hammer falls, the cylinder is locked up tight! It cannot be wiggled! And, its accuracy is first rate. I do have to tighten all the screws, particularly the grip frame screws every 25 rounds or so, but I have no other complaints.
I owned a similar 80s vintage .44 Bulldog and had absolutely no complaints about that gun either. For some unknown reason, I allowed someone else to trade me out of it.
Dan