On Swiss lugers, barrel wear should be the main problem area. It still is the main problem on more modern Swiss firearms as well. Add to this the fact that the Swiss shoot long and often and that the Swiss have been very fond of steel jacketed ammunition and you can see why the rifling goes first.
The ejector spring is a problem area on all lugers, because it is always in a state of tension, with the toggle open and closed. Metal fatigue will kill it off in the end. So this part will be as breakable on the Swiss lugers as on any other one (including the post war Mausers).
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