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Hello Zong, thank you for the guide of repairing WE m4 mags. I recently had problems with my M4 Mags. A question, when rescrewing the fill valve back at the bottom of the mag, how much pressure or how far in do you screw it in, I ran into the problem of breaking the top "plate" of my fill valve. I ordered another one and screwed it in lightly. I experienced a leak, I tried screwing it in further and it also broke. Thank you!
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