Having things looked at is a wise decision in my opinion.
These guns are getting to be close to a 100 years old, passing thru a lot of hands, and originally were hand fitted. To me, numbers matching, means nothing to the shooter type; it is the fit that matters in actual use.
The Luger breeching system is one that has a cut for the extractor and one for the feed ramp. Both intrude into the chamber proper. How original ..........is original? Cartridge heads are strengthened at the head, and a little ways up the case body, not a long ways though. So the more case exposure you have, the more potential for issues occur. There are dwgs around that show the original numbers for this criteria if so interested.
One always hears about headspace in firearms. Headspace is only one safety criteria for a shooting weapon. Oddly enough, one could remove 1/2 of the shank of a Luger, and it could still pass headspace dimensions, but of course, would be completely unsafe.
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