Hi Heinz, The rolled sheetmetal mags are just crimped tightly together in a final forming die with an inside mandrel... There is no solder or any type of adhesive in the seam.. in fact, in order to make this joint, the metal has to be about dead soft to maybe quarter hard... (one of the major problems with all luger mags!) You will occasionally find an original mag that has been slightly heat treated or made with too hard of steel, and they will seperate in this critical joint... it was a lot of work to make them... and still is! best to you! till...lat'r....GT
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