What is the staple looking piece at the rear of the receiver ?
Is it where they located the lanyard loop ?
I'm glad to hear that it works so well for you, it contradicts everything I've read about them in gun magazines .
But since it isn't the latest greatest I probably should not be surprised.
You are correct.
The "staple" is actually a lanyard loop. The German Navy adopted the pistol first, and had a very deep holster that enclosed the entire pistol with the cover. A small tie of leather tassle/lanyard made retrieving the pistol easier with gloved hands.
Even on the research I did, the Luger folks agree that the weakest link of Luger reliability was the magazines
and the need for the pistol to remain clean and lubed. America actually made Lugers for a time and considered them in .45 caliber.

The American Crest make them very collectible.
It likes to be clean and lubed, with good well maintained and stiff spring mags, hardly the parameters John Browning set for the 1911.
Lots of things take place in the fraction of a second to cycle the action. Lots of hinge pins, and movement along the slide and rails of the breech toggle action, with a few springs thrown in to return it to battery.
It was expensive and complicated to make back than, and required more precise fitting, and machining. What Georg Luger did however, was also improve the balance, and grip angle, and create the 9mm Parabellum, or 9x19 Luger rd, specifically for the than "modern" versions.
What it did for improving accuracy, did detract from its reliability if covered in mud, snow, ice, salt spray, dirt, etc,... Hence the holster that could withstand a hurricane blizzard, and not one flake or drop would get to the pistol.
It also was designed to shoot the original 9mm ball with an overall length of 19mm. According to the Luger folks, the Remington 115gr. FMJ most closely matches the original. They also advise NOT to use hollow points.
It won't be my nightstand pistol, or my IWB carry piece by any means. Just a shootable, accurate, piece of history. However, the M9 military 9mm FMJ's are standard issue, and work as needed. So I always have that.

A Luger to the back of the head of many a sad soul was 99.999% effective. I'll keep learning about it as I go, and get more familiar with all the cartouche, and other marks and symbols on it.
Here's a short link of the history of its evolution.
http://www.huntingsociety.org/HistLuger.htmlAuf Wiedersehen
