[mogunner]

Keeping magazines loaded will not weaken the spring. Spring steel fatigues through useage, not being kept loaded.

Stay away from the Korean magazines, they are well known for problems. I generally buy European steel mags for my Saiga and have had no problems at all with them. While not a big fan of the polymer ones, the Tapco ones seem to work well, I have a couple of ten round ones to use while hunting that have given me zero problems as well.