I have a number of S&W revolvers. When I get a new one, before I shoot it, I do a careful examination. I check the lock-up, carry-up, trigger pull, endshake, etc. I then do what I have to do to get it the way I want. That usually means lightly smoothing the internals, often replacing the rebound spring, sometimes recutting the forcing cone, measuring the chamber throats, etc. When I get done, I have a gun with proper carry-up, tight lock-up, with a nice trigger, ready for the range. This typically only takes an hour or two. Do I really have to do all this? Probably in most cases, no, but I do it because I like to do it and I can and I think it results in a better gun.