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LM4 Blowing all its gas after a few shots


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#1 Icurblud

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Posted 14 April 2013 - 12:51 PM

I have an LM4 Magpul Edition with 3 Pmags.  I play 90% indoors, i use green gas and propane.  When i use propane i put 1 drop of the kwa silicone under the adapter every 5-7 mags fills.

Just wondering about an issue i just started having yesterday.   2 of the 3 mags i have blow all its gas out after firing a few rounds.  1 of the mags work flawlessly.  So i rule out the gun issue.  What would make the mags do this. I clean and lub my gun often.  The bucking has no oil on it.  The "air nozzle" that houses the flute valve is free moving and doesnt stick at all.  Could it be the gun?   or the mags themselves.

#2 BeachEMT

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Posted 14 April 2013 - 02:56 PM

Have you tried the solutions that are posted on how to fix leaking mags?

#3 Icurblud

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Posted 14 April 2013 - 03:28 PM

Beach i did.  I figured its not a leaky mag.  Like leaking from the bottom fill valve or the valve up top.  I an fill the mag without any leaks, but put it in the gun and fire a few shots and it blows all the gas out.  Unless i missed something, the leaky mag thread is about leaks from the fill valve and release valve

#4 BeachEMT

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Posted 14 April 2013 - 03:49 PM

Have actually tested to see if it's leaking? Filling it and either holding it under water or using soapy water? Unless you listen very closely sometimes you may not be able to hear the leak.

How much gas do you have left in your gas bottle? I tend to notice this kind of problem towards the end of a gg can.

#5 R_King91303

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Posted 14 April 2013 - 04:27 PM

If it's two of the three mags, then to me it sounds like the release valve is sticking in the open position when the hammer strikes it. Have you removed the release valve to thoroughly clean both ends?


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#6 apilar

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Posted 14 April 2013 - 08:47 PM

It can happen if the oring in on the nozzle in the bolt gets stuck. This happened to me before.. awhile ago so my memory is a little foggy.

but as far as i remember the nozzle was getting stuck in the bolt. Take it out, clean it, lube it and try again. The gas venting is because the bolt isn't come back to hit the disconnector and without the reset the gas just keeeeps on coming.

Edit: noticed you said it worked with 1 of your mags. I would check a sticking mag valve. just because its not leaking doesn't mean it doesnt stick and vent the gas

Edited by apilar, 14 April 2013 - 08:50 PM.


#7 The Nutty Professor

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Posted 14 April 2013 - 09:58 PM

Mag problem

#8 Chuck S

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Posted 15 April 2013 - 02:54 AM

Cleaning the release valve has fixed this problem with my LM4 and other gas guns.  A valve wrench should be on your next parts order as it simplifies this task.

-- Chuck

#9 Icurblud

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Posted 15 April 2013 - 07:41 AM

I cleaned the valve, put a few drops of silicone on the oring and reinstalled.  Fired it this morning and it seemed fine.  Like other mentioned maybe sticky valve. Thanks




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