Now this is just me again; I wouldn't even change out the screws. Rohrbaugh, several years ago did have a screw probelm, and on RJ Hedley's (rest his soul) post had a call from Eric R. saying the screw problem had been fixed. They went to a stronger screw.
We just had a Forum member last week, was changing out some black screws, going back to the original silver screws and stripped out a black screw, which was after market screws, and had to send it back to the factory to get removed.
Again, to each his own. If you don't see a problem, I would leave it alone. Do, however, check for loose screws after each shooting. I don't want to cause myself a problem, and haven't had one since owning the R9, for, come March 13, a year; also, no loose screws. Others may differ, and that's OK.