Help with 91/30 stock marking?

[rum_runner]

Scored another Izhevsk , 1944 ex-sniper. Already have one, and having owned 3 more, I had found the meanings of all of the stamps/markings on the net. Or so I thought

This one has a distinct reverse/backwards "R" stamped on the stock on the right side, below the front of the sight base, almost upside down, with what appears to be a faint "K" below and to the rear? Both in no symmetrical order.

I can find no info.

Information

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[Sentryduty]

I have seen markings like this on one of my Russian rifles, no idea about the meaning, I will see if I can find a photo for illustrative purposes.

[Eaglelord17]

The 'K' is apparently a point of aim proof.

[vintage hunter]

The 'K' is apparently a point of aim proof.

The ''K'' POA proof would be in a circle and located on the barrel shank.