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I can't think off hand of any company in the U.S. that did any mass sporterizing of those rifles except for mounting cheap scopes using cheap mounts. They sold for under $20 and were not considered worth the effort to make them anything other than low-end milsurp. I may be wrong, but I suspect your gun was sporterized by a gunsmith or a previous owner and the object was to make a handier hunting rifle with little concern for any effect on accuracy.
As for sight changes, I suggest you wait until you have fired the rifle at a reasonable range (100 yards?) before making any sight changes.
Jim
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