Just did this to all my mags for normal maintenance. Remove the entire valve from the mag (they unscrew) and work in silicone oil everywhere while the button is depressed and give it a few compresses and work in some more silicone oil. I found putting oil on from the exterior couldn't get into the tight spaces so it's best to dissasemble the whole thing. Replace and put silicone oil on the rubber gasket. Let sit for a minute while you put the mag back together, refill with gas. Heat up the mag in your hand a little bit and then put one mag through it and the valve should be working freely and should not be leaking either.
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