Ron, If the work was done at Remington there will be no record that we know of documenting their work. There may be a Remington date code stamped in the barrel flats but for the most part there is nothing available to us that tells us what was done.
There are very few and rare examples of Robert Runge's signature on his work. Don't expect to find it on your gun - the odds are like hitting the Mega-Millions.
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