by akodo on Fri Aug 02, 2013 10:02 am
A spring wears with every CHANGE that happens.
So a spring that is loose gets compressed...that's a change.
A spring that is compressed gets released...that's a change.
So leaving a magazine loaded will not do any harm.
I SUSPECT the tale about 'don't leave them loaded' came from when people would carry loaded magazines on their person, either in the gun or as spares. Once you fully load a magazine, you can normally still push the last cartridge down just a little...not enough to load another round, but just a little. As police run, jump, and do other activities the column of cartridges bounces up and down. That's a cycle for the spring, even though it's not a full expansion and compression. After many expansions and compressions, the magazine didn't work well, and people erroneously attributed this to 'being loaded'
So leaving the magazine loaded in your nightstand is not a problem. But those magazines you carry around, replace if you even think something might not be totally right.