I can see the outline of a screw in that mess on the side. There's actually what looks like two round spots, one up to the 11 O'clock of the lower bigger one. I suspect more like someone's tried to hide some work. They may or may not go all the way through. It's not an original flaw though. No inspector would accept that disfigurement. You say there's no inspector's stamp, but I still think this was done way after by less than the rifle team. Still, a nice shooter.