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However, I routinely see rust, dust and dirt result in a magazine that doesn't want to feed for unloading. Springs and feed lips may not be the weak point. Most of us have metal magazines, steel springs and environments that are to one degree or another dirty and humid. Those aren't the ingedients for long term reliability.
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Beat me to it. spring steal will oxidize as easily as any other. That is obviously going to affect the spring strength, even after rust is removed. Binding, rusting together, and such can cause problems too.