The Luger barrel is like a rifle barrel, it is screwed into the receiver. Normally, the barrel was screwed in and brought up to the witness mark. If it would not draw up, the shoulder was trimmed a bit; if it drew too far, the shoulder was rolled. Then the short chamber was reamed to get the proper headspace.
All of this was just one of the reasons for the high cost of the Luger and the reason the Wehrmacht wanted something cheaper and more reliable.
Needless to say, the factory did not use Super Glue or Red Loctite. GL would not have liked that.
Jim
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