ERMA small box 22 conversion.

[Steinar]

Originally Posted by Mauser George

I believe this small box 22 conversion was manufactured in mid 1937. I have fired it several times and I do have to attest they are nice to own, however they do not function with a dam. Granted the E/77 10 round magazine has a weak spring so I purchased a post war 22 conversion magazine with stronger spring and results were the same.

Lugerdoc here in the forum gave me the advice to remove the ejector before installing the set. Made mine function quite flawlessly, perhaps you have it installed?
btw. spring is supposed to be a bit weak on these .22 mags.