Back again,
It now comes to mind that many of the 1960 era Stainless Steels, 18-8, 17-4 ph, 300 and 400 series sainless steels were soft soldered with good bonding of surfaces using a special highly corrosive acid called "Ruby Flux".
added edit:
I believe that the modern Stainless Lugers are Investment Cast and I have no idea as to the type alloy steel that would be used.
ViggoG
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