WE m4 magazine upside down

[Apathy]

Soo...my m4 mags leak when they're upside down or on their side. It's coming through the gas nozzle at the top, so I'm guessing its the output valve? My question is why it's leaking when the magazine's not upright but stops when it's standing straight up??

Are there only 3 o-rings in a output valve? is there an inner one? Should I buy o-rings or just new valves.. Are there any o-rings or valves that would be recommended over WE replacements?

Also two of my mags just leak regardless of position through the same place.

[Kos-Mos]

I bought new valves because why not.
It's faster and easier to fix.
Might buy some new rings for the "broken" valves I have

Your mags probably leak when upright, you just don't see it.
You can put a little water in the rubber at the top to see it, there will be bubbles.

There are 3 o-rings, usually the one at the tip on the silver cone is the one that leaks.

O-ring kits are 2$, valves are 9$.

[Apathy]

Where's the best place to get them from?