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GBB leaky mag


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Old July 18th, 2009, 21:08   #1
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GBB leaky mag

I have been looking at the classified for a GBB and I see a lot of them with leaking magazine. Is that a very recurrent problem out there? Can it be fixed or will I need to buy another magazine?

With all those leaking magazine GBB out there I am a bit worried of buying one.
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Old July 18th, 2009, 21:23   #2
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Souvent, le monde font pas attention avec leur Mags. Faut toujours que tu laisse un peu de gas dedans quand tu les range et il faut mettre du silicone sur tes o-rings/dans ton mag tous les 5 refils environ.
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Old July 18th, 2009, 22:22   #3
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depends where the leak is. if it's from the flow valve, you can replace the valve or attempt to fix it. but it depends what's wrong with it. I had one that completely seized up and would vent.

if it's from the main seal, bottom, there are a few things you can try to do. you can try to get a replacement main seal, you can try to give it a silicon oil bath to swell it up, or you can try to teflon tape it. some mags can be fixed by simply tightening the screw on the bottom to force the seal to work. other mags like the mk23 are held closed with retaining pins instead and take a little more effort to seal.

before buying a used gun, make sure you can locate mags for it. especially if it's not a mainstream pistol.
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Old July 19th, 2009, 08:17   #4
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Number one reason mags leak is because they were stored without ANY gas in the mag at all. I've seen guys end of the game day when packing up their gear empty the gas out of their GBB mags, I'd ask why, they said they didn't want their mag damaged by keeping gas in them. They were shocked to find out the damage comes from no gas pressure during storage at all. I've always kept gas in mine, even if the mags sit for months unused, they never leak (I've got 8 KSC G19 mags and two KSC Mk23 mags). And the most common place that the leakage would come from is the main gasket at the bottom of the mag, it'll shrink a bit because of no gas pressure, and cause the leaking.

I've fixed a good dozen GBB mags over teh past couple years, all same problem, and I found the best way is to use the blue gasket maker gel found in the automotive department at Canadian Tire. Remove the bottom of the mag (often found by punching out two pins), smear a good amount of the gasket gel around the rectangular rubber gasket, reassemble and let sit a full 24hrs before putting any gas in. Then fill and test out. If you put gas in before the 24hrs is up, it won't cure properly, and if you test fire the gun during this period, you'll get vapourized gel all over the insides of your gun........... totally not fun to clean out!!! (How do you think I learned about the 24hr waiting period? )
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