Data on Luger barrel thread specifications

[DonVoigt]

Originally Posted by Norme

Hi Don,
My statement is based on observation, the "witness marks" on military Lugers that have seen a lot of use frequently indicate some over tightening. Also since the only other such marking on military Lugers is on the front sight it seems like the most logical explanation. If you can come up with a more rational explanation i'd like to hear it.
Regards, Norm

There has been much discussion on witness markings and no conclusion that I recall.

They make some sense if one wanted to remove and re-install a barrel.

Many witness markings do not align, neither were they struck at the same time with the same instrument on the flange and receiver.

Some years back Dwight Gruber was doing a detailed study of the witness marks and what they might indicate, and when they were applied.

I believe that in this case logic has little to do with the presence or absence of the witness mark.

With some 40-50 ft lbs of torque applied to seat the barrel,
I do not subscribe to the rotational torque from firing being able to "tighten" the barrel though.

And what about the witness marks that don't align the other way?

A puzzle for sure!

Maybe Dwight will chime in with his idea or conclusion.