Hello Dwight & Heinz! Here is a little bit of information that I once received from John V. martz, whom has probably replaced as many Luger barrels as anyone... he told me, in an informal conversation that he primarily lines up the extractor slot in the barrel with the releif provided for it in the receiver... in this application, the witness marks mean nothing...of course, the assembly must exhibit the correct torque during assembly... but by and large, I came away with the idea that barrel assembler's from that era, must have had a considerable amount of acquired skill to do it fast and correctly! till....later....GT
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