Yes, I have.... on a 1939 Luger that my father and I bought about 1956. It also had silver solder on one side that I suspect filled a damaged place.
As I recall, Pop wrote to the NRA Technical Staff and their answer was that the counter bore was likely due to damage to the muzzle... the silver solder being another indication of damage. I also believe that they mentioned it may have been a field repair but I won't swear to that. It certainly would have taken a lathe to do the work.
The Luger had some mis-matched parts so Pop had the barrel replaced with an 8" tube.
Now the interesting part. I still have the 4" barrel and I'll try to take a picture of it's muzzle tomorrow and post it here. (I also still have the Luger).
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