Yes, I have a friend who has a non-Erma sub-caliber insert. (It was I who told him what it was.)
Here are the essential details - there is an Erfurt frame that matches all of the parts except for the slide, barrel, and magazine. Then the slide and barrel are matching and have a G date code. (To clarify, the breechblock and extractor match the frame.) The slide appears to have been refinished - the proof marks were a little dished out from a quickie buff job. However, the frame and its related parts appear to have their original finish. The import is that someone took the original Erfurt gun (complete) and then fitted this new barrel slide assembly, but otherwise used all of the original parts.
There are no import marks on the gun. The seller had the impression that it was a WWII bring back. I did not see any Third Reich proof marks, but I was not looking close. And like I said, the proof marks on the side of the slide were not 100% clear.
What I am wondering is whether this is some sort of factory rework that was put together for (presumably) a silencer. Did a GI come into possession of it and bring it back sans silencer?
I searched for posts discussing threaded barrels and didn't really find much that was helpful . . .
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