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Well, the steel insert in the receiver goes up the sides and over the top but I don't think it is thick enough to mount a GR site (after drilling and tapping). An option would be to glue one on top using an epoxy or polyurethane, something very strong but is able to handle some flexing and vibrations. I wouldn't trust cyanoacrylates (superglues).
If the rifle site on the barrel is the same as the ones on the M1s and M3s, then maybe you can replace the adjustable site notch (which is held in place with a set screw) with a GR that you or someone can make (and use the exisiting base).
- Ron V.
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