Rotating ammo in mags.

Loading and unloading mags puts much more wear and tear on the mag springs than leaving them loaded does. While there may be some degree of spring set it will be minimal and less than the damage from loading/unloading.

Besides, if a spring fails to feed from being weak a nice "tap" at the mag bottom should help load the next round. If a spring is broken tapping ain't gonna help much.
 
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