Actually the concentric ring mags were introduced to differenciate 9MM magazines from 7.65 by a method that could be detected in the dark. This info was given to me by Nico Van Gjyn, who owns a great deal of oriiginal Luger plans, files and correspondence.
The Navy continued use of concentric ring magazines throughout the war, although one occasionally finds matching non-concentric ring mags witha Navy gun. This is far more prevalent in Post-war/Weimar era guns, tho.
There is no documented explanation of which I am aware as to why the Army chose a different magazine plug style.
Tom A
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