Here is a challange for you ...find an origonal peep sight for it....they made one that was on a hinge that the bolt would swing it out of the way both directions and fall back in a detent ..all spring loaded both ways...it sounds hoakey but it's very precition made thing...I have only seen one ever...and the guy won't part with it...it's also on an 06..
My eyes is 257 Roberts and it came to me with a echo mount...since it was drilled I kept it and run a vintage Lyman scope with post..
It's a pretty sweet setup..