Randy, It's possible, but unlikely.
The work actually didn't remove the final acceptance stamp (which has the Nazi symbol under the eagle) and they didn't appear to have touched the barrel stamp (clearly visible in your picture).
My best guess is that there were some finish issues on just the area on the right of the receiver, and the owner wanted it to look good.
One possibility is that the area had blood splatter which removes the bluing. That could have bothered the owner.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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