I won't go as far as either Harry or Dave, and I have tuned Rugers. I admit I am more at home with S&W or even Colt, but the Rugers can be helped a bit. The main thing is to smooth things up, without any drastic changes. There are a few things I have done, like work on the mainspring, but I don't think I want to suggest them as a DIY project.
A good question for any revolver tuning is what the gun is to be used for. If only for range play, it is one thing, and you have a fair amount of leeway. If there are problems, the customer can come back and complain. Note that "CAN". If the gun is a police gun or for serious use, and it fails, the customer maybe CAN'T come back, a different situation.
All makers of serious guns (not toys like the superdooper 1911 type pistols) build in extra spring power and the like to handle adverse conditions like dirt and cold. Most "tuning" jobs reduce that extra margin. In the worst case, no margin is left and cold, dirt, or just a hard primer could mean the user pays for a tuneup the hard way.
Jim