Hello Postino,
I do not know if I understand your question correctly - the silver tube is for cleaning;
I show another pics - one with the conversion from a small box fitted to a pistol -
and I made some to show how to use the cleaning rod contained in the large box.
The smaller, later box did not need the alloy insert for cleaning the barrel, because at that time they use the "Reinigungsgerät 34 " for 5,6mm:
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