Yes indeed this is the sniper rifle. In the re-arsenal process, the turned down bolt is swapped out for the straight, and the holes for the scope are welded over exactly as mentioned. I can raise the price if that helps the skeptics feel more secure.
ex-snipers dont really bring any premium over any other 91/30. They were removed from service for a reason and the turned donw bolt and scope mount are what brings the money, and IMHO you will have a tough time getting that kind of money out of what you have.

