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There's a belief that mags are shipped with gas.
I believe that they aren't and is merely a misconception.
"So what is that little puff of air that I get when I press the valve of a brand new mag?" I hear you asking.
That bit of air is the air you get from de-pressurization and re-pressurization as the magazine goes 30,000 feet up into the air... across the pacific ocean and on to North American soil. Combined with the incredibly cold temperatures of the cargo bay at that height and re-temperaturization once landed - what you get is an imbalance of air pressure levels between the inside of the mag versus the outside world.
Sometimes (many times), the spring on the release valve is weak enough to allow pressure to balance out between the interior and exterior of the magazine - and as a result, you don't get that same puff of air from a brand new mag.
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