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I've done a search, and I can't find any info. I have a Garand with a funny stain on both sides of the receiver, but there are no grinding marks I would expect to see if the receiver were rewelded.
If you can get hold of a copy of Kuhnhausen's book he describes the problem in detail. Usually front & rear will be from rifles of different mfr. Alignment problems, pits, cracks.