Local Boy wrote on Jan 15^th, 2019 at 7:13pm:

Hi Spectrum, It looks like the original rear sight screw holes are still available for use? If your interested, here's a different option for mounting a scope to the top of your barrel.   (You need to Login The screw holes on the side of the receiver can be easily filled with set screws or by any other means you choose. The setup I have is for a scout scope configuration with a long eye relief.

That link no longer works.  Just Google "Krag sight rails," and you will be able to find the new web site.