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I just watched a Military channel piece that detailed that during Vietnam, grunts would only load 16 rounds into their 20 round M-16 mags, because otherwise the springs took a set and the mags would malf during combat. I have never had a problem with long term loaded mags, pistol or rifle. I have two Colt/Umarex 30 rounders that have been fully loaded for close two years - next time I hit the range I will take them and see what happens.
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