I had written a long reply on my phone but the damn sensitive touch pad deleted it.
Short answer: No it will not work.
Longer answer: Compressed air is not liquid under pressure, therefore you need to have a high pressure in order to have enough volume to make it worth your while and last. You mag is only meant for the low pressure (100-200psi as stated in think, not positive). Filling it with 100-200psi of air will do nothing after the first shot in believe, if that.
I had the same questions a few months ago with a new gbbr. It can't be done without things like an external tank, etc.
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