I asked an engineer once about this his answer was cycling the spring will cause failure before leaving it compressed will. The majority of springs in use in valves, switch's, PSV's are under tension in normal operation. I have read that some pistol magazines and shotgun will lose tension if stored loaded. I know on my uncles farm he had mags beside the back door 24/7 loaded for the M1 carbine and the Lee Enfield they both were always working.
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Si vis pacem, para bellum
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