I MIG welded a corner of my C96 bolt back into place a while ago. The bolt is in the white, and after filing and polishing there is no visible discoloration whatsoever. I used the standard 0.8 mm welding wire I normally use for car restorations and it worked out well. Of course, the slight differences in metal composition can affect the end result, but I think that it will be minimal at best.
I read about restorers cutting up frames or gun parts for 'donor rods', using these to fix issues on guns while keeping the same metal composition in the weld material.
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