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Springs don't "wear" due to being compressed and left at rest. They fatigue as a result of long-term repetitive compression and extension over the course of MANY cycles.
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This is not true.
It is true ONLY if you don't reach the elastic limit of the spring travel. If you compress a spring into the range of plastic deformation you will change the structure of the spring metal.
This is an issue with magazines that are pushing the limits for space or have springs of poor composition. Which is why I don't buy 17 round mags designed for 15 round magwells.
For recoil springs this isn't academic. Someone just posted the other day about an Army armorer that stored the M9s with slide locked back, and the springs wore out quickly.