Recently bought a new 686 and the hammer and trigger both had rust on them! I was planning on smoothing up the insides so it didn't bother me. But that falls into the category of so much for Smith & Wesson's advice. Ir you are going to shoot the gun regularly it doesn't hurt to learn to open it up and clean it properly. Get the right tools and learn to open it up without doing damage. If you are just going to shoot it infrequently then you probably can get away with leaving it alone.