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This gun has two tapped holes about 2 1/2" apart on the left side of the receiver that look like they were made for a side mount. !
The two screws go into the ejector assembly which is internal to the receiver.
I believe your only option would be to drill and tap the receiver. Finding a gunsmith able and willing to do it is another thing.
When I was young and brash I probably would do it. But now I would probably would leave it be.
Michael
