Does anyone know what is the difference between the X-valve (marked with and "X") and an E-valve (marked with an "E") on AGD E-mags. I'm looking at an E-mag for sale right now that has an E-valve and I was wondering if it'll be necessary to upgrade to an X later (which isn't cheap) or if the E-valve will work just fine.
Thanks in advance.
Thanks in advance.

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