The main difference between the pre-1945 and postwar Erma conversion kits is that the early model had no extractor. Instead, it used a small extension on the .22 magazine as extractor.
The new version had a separate extractor, so the magazine lacks the extractor 'notch' that the old ones had. An old mag should function with a new set, but a new mag will not extract the rounds in an old set. Perhaps playing with extractors and magazines can produce a workable product, but those .22lr kits are not the most reliable feeders to start with.
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