Thats what I was looking for, some kind of reasoning behind your opinion.
I see the logic behind what you were/are saying. these things make sense and offer a smart outlook. however there is very little room for the seals inside a mag to expand to and there is a very low likelyhoodthat the rings will bloat.
As far as the thickness and insulation of a mag the average mag wall is around 1/8 of an inch thick. as far as I know thats thicker than any propane tank Ive ever seen.
Finally as I said I have for the past three years kept my mags fully charged and during that time I checked a locked pistol case with my gun and 2 full mags as luggage on southwest airlines when I flew to california. I will admit that I should have emptied them becasue of the drastic elevation/pressure change, however I forgot to and when I arrived I found both mags in normal working order and still charged.
thaks for the insight however. it is a good addition to this thread