There were two versions put out by the Remington Custom Shop. One was a standard model with full round barrel, plain stocks, and plastic buttplate. The other was a high end version with half octagon barrel, presentation grade wood, steel forearm tip, single set trigger, and steel buttplate.
The high end models seem to be consistently better fit and finish, and are usually very accurate. The standard guns have been less consistent in all these areas, so we see both good and bad.
I have a set of the high end stocks on my latest Rolling Block build, and was pleasantly surprised at the quality of the wood, checkering, and finish. They really did a very nice job considering they were CNC inletted. I also purchased the matching pistol grip lower tang and thinned my military upper tang to fit the stocks.
Mine built from original receiver and Custom Shop parts is chambered in .40-50SS.