I don't believe that these two screws would be used for optics or other sighting device because operation of the toggle would destroy anything mounted back there.
I can offer my guess that these two screws were used to mount some kind of a custom shoulder stock in conjunction with the standard stock lug...
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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