Adam, I think your question is a good one and I'm only guessing that large shops such as Beretta, for example, do use CNC equipment for stock production. The advantage being that once you have a program set up you can reproduce for a larger run. That said I have two very good friends that have CNC equipment. One uses for producing very complex barrel contours complete with full length integral matted rib and the other to produce very high quality rifle actions.
I can only guess again that shops such as H&H might use CNC but are certainly use high quality pantographs such as Hoenig for single use. As I said, I'm only guessing.
