Hi,
I bought a mint (rebuilt and saltdip blued) shooter grade S/42 for sports shooting purposes. Have fired it regularly over a period of a year now, with some 100+ rounds a week and I decided to closely watch it's wear patterns.
The wear patterns after 1000 rounds of 124Gr S&B:
-Slight blue wear on the right receiver side, where the trigger lever meets with the receiver.
-Slight blue wear on the back of the frame where the toggle meets the frame (front of the ears and back of the frame).
-Slight markings on receiver and frame rail.
-No distortion of any parts whatsoever.
-No visible wear on barrel, chamber and barrel lining.
-One broken (aftermarket) ejector (side)spring after only 300 rounds. Replaced it with an original one, no problems after 700 rounds.
This certainly helped me to estimate the functional life of a Luger. (Loooong

)