In my opinion, there is no 'flaw' with the magazine and nobody has 'messed' with it. What would be the reason to change a button to a flat-type? It is possible that DWM was using up old parts and combining them with newer parts. The retaining pin at the bottom of the magazine is perfect and untouched, so I believe that the integrity of the magazine is correct even though the flat button was theorically intended for an early unrelieved frame.
Albert
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