I personally think that the 'stress' on a spring is very little - many reports of folks keeping a mag loaded for many years and it still worked fine (as an example). Not that it shouldn't be a consideration, but I think some folks worry too much about it.
I imagine that the locking bolt (take-down lever) spring retainer and the holdopen are broken the most, they are small and under pressure constantly, especially the locking bolt.
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