Gonna bump this and hope for some responses.
Does anyone know the size, specs, etc of the original grip screws. I'm going to start stocking up on parts that are likely to need replacing and/or prone to breaking, and grip screws would be amongst those. I know I was able to buy a box of replacement screws for my Remington RM380...it was not a particularly uncommon size, and I just bought a box of 100 or so for, if memory serves, like $25. That certainly would be the way to go if these screws aren't proprietary to the Rohrbaugh.