Re: surgeon action variants?
Yes. There are serial numbers beginning with A, B, or C in the 591 (short action). Each action serial number starting with a certain letter had a modification from the previous one. I have a B serial #, and IIRC, the mod was something to do with the bolt. The mods were very minor in nature. Maybe Wade or Preston can shime in for the exact differences. I know if you called Surgeon, they could tell you specifically what those mods were.