My gut intuition says the same… looks like a typical gb turdUpper band looks like original s/n ground off and re-done. Upper band and optic base have the same font, upper and lower pieces of the optic mount are different font. Base appears to be mounted at an upward angle. Finish wear between rifle, optic, and mount don't make sense. I don't think Oberndorf made SSR rifles?
I'm far from a SSR expert, but this looks super funky to me.