Rob, the standard line is "take it to a gunsmith and let them check it for safety".
With Lugers (and I am no expert on things like this), the barrel and the extractor have to be lined up, so unless you have a mismatched barrel or mismatched or damaged breechblock, then its hard toget out of whack.
I have never tried a no/no go gauge on any luger I have fired, although I'm more of a collector than a shooter anymore.
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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