Just a general comment:
I don't know anything about Luger gunsmithing, but I have done work on old guns. Any process that removes metal (a "subtractive" process) should be the *very last* thing you do to fix something on an old gun. Old guns develop problems because they have too little metal due to wear, not because they have too much (unless new parts have been added and need fitting). I have seen some valuable old guns made irrepairable because someone (a gunsmith in a couple of cases) started filing or stoning in an attempt to fix some problem without really diagnosing it first. If you think you need to remove metal, be absolutely sure before you do, do not guess and "try it" because it's hard to get the metal back later if you're wrong. Do NOT assume that a gunsmith knows anything about old guns - they should, but they don't always - and they are capable of some real butchery that cannot later be fixed.
Just my .02
H
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