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I don't think it's supposed to vent while filling. Maybe once it is actually full. Those mags that vent are never able to get through a full mag. I've been wrong before but I don't think gas is supposed to be spraying everywhere when you insert the propane adapter.
The orings I bought were from the McMaster-Carr catalog but I got them cheaper through ebay. Measured them with my micrometer and they match the specs on the catalog.
I got this information from a couple different forums and YouTube videos, some of which mentioned their marui mags did not come with orings either.
I'll check out the sequential orings.
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