If you regulate it into the mag, you're essentially putting the gas into the mag in it's gaseous form.
You'll be lucky if you can get 3 shots off before running out of gas, with a drastic difference in velocity between the 3 shots.
Liquid form is how gasses are stored in the small confined spaces of gas airsoft guns in order to maintain a somewhat stable output level as well as getting more shots.
That's why you fill mags with duster/propane tanks upside down. To inject the liquid.
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