[spanishjames]

But magazines can be lost, or damaged, and they do wear out faster than the rest of the gun. Thin metal, holes that can become worn, springs that can wear out, mag lips that can become bent or deformed. Sometimes just dropping a mag on a hard surface can be enough to screw it up.

And, lets say you can't easily or cheaply get replacements? How many would be enough to ensure a lifetime of reliable use?

Great, now I need ten of each. Thanks a lot.