I have the same problem (I think) with my TM M9 mag. It's as if the fill valve is too small for the adapter. I have to order some feed lips, so I was thinking of just ordering a replacement valve as well.
Funny story about the feed lips - I was lending it to a friend at a game, and showed him "be careful not to let the mags fall on the ground, because they might fall like this *turns mag upside down* and land on the feed lip and- oh crap! *mag slips out of hand and lands on feed lip* and...do that". The next game another one did get dropped by someone borrowing it, with the same result.
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