"One physical phenomenon with metals is that at stress below the yield strength of the material a very slow plastic deformation take place. In the spring branch this is called creep when a spring under constant load loose length and it is called relaxation when a spring under constant compression lose load."
http://www.lesjoforsab.com/technical...durability.asp
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A loaded mag sitting on a shelf does not continually weaken the spring.
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While many may not have personally experienced spring creep and relaxation in their own magazines, that does not mean that it does not exist and plague some magazines and guns.
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What weakens springs is overloading of a springs intended use
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Simple and well put statement on this topic.