I have had something Okay magazines loaded in 2012 and I don’t worry at all leaving the springs compressed in the magazines. If you shoot the magazine and reload you are causing some wear on the magazine but it take a lot of cycles to wear out the magazine springs.
I take the same magazines to the gun range for years and never had a single failure with magazine springs. I am fairly new since I bought my first AR in late 2010.
Longer than the search function takes that’s for sure.
AQ planned for years and sent their A team to carry out the attacks, and on Flight 93 they were thwarted by a pick-up team made up of United Frequent Fliers. Many people look at 9/11 and wonder how we can stop an enemy like that. I look at FL93 and wonder, "How can we lose?". -- FromMyColdDeadHand
Amen to that, those things' springs don't care one iota about being left loaded.
I have 6 gen1 pmags that have been left fully loaded since about 2008, with the dust covers on, and all still function fine. I have several other non dust covered pmags and lancer mags that have been loaded for at least 5 or 6 years, that also function.
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