Mysterious 10mm magazines finally come to fruition. It appears these 10mm magazines were a proto-type using the 645 frame. After fitting the magazines and comparing to 645 mags, they are exact except the flaps that hold the 10mm rounds from bouncing out. There were only a few 10mm's built that would take these magazines but I do not know if the 645 10mm proto-type ever went into production.
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