Hi Dennis, A couple of points: Barrel length is measured from the muzzle to the face of the breech block. The easiest way to measure this is to insert something thin, like a drinking straw, until it hits the beech block. The illustrations you show of C/ M and C/N marks are laughably out of proportion. It sounds like you have a pretty common Commercial Luger with a 3 7/8th" barrel made in the 1920's.
Regards, Norm
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