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Is that normal ?


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#1 KeithHK

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Posted 05 April 2014 - 06:37 AM

My lm4 made 20 shots in full auto and about 10 more shots in semi-auto. Then, it went pssssssssssstt. White smoke is given out through the barrel and chamber. Then I tried to shot it in semi-auto. It had made a little more than 40 shots before it went pssssssst. In both cases, I had charged it for 10 seconds and the temperature is 77 degrees. Is that normal for the lm4 ? Or I should charge it longer ? Thx in advance.

Edited by KeithHK, 05 April 2014 - 08:11 AM.


#2 netpoc

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Posted 05 April 2014 - 07:37 AM

You need to fill the magazine until the filling sound stops, around 30-45 seconds. Also, cold ambient temperatures can affect performance as well.

#3 KeithHK

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Posted 05 April 2014 - 08:10 AM

Thanks netpoc. I have heard that performance of kwa lm4 is much better than that of other m4 but I've seen a video on YouTube that a m4 of WA system can shoot better that mine in 50 degrees!!! That's why I was unsatisfied with my lm4. May I know how does yours perform around 77 degrees ?

Edited by KeithHK, 05 April 2014 - 08:10 AM.


#4 Jatodude

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Posted 05 April 2014 - 11:01 AM

Hi Keith, it seems that this is the second time you've asked this question. I'd stand by my previous reply, it really sounds like the cylinder base plug is freezing up inside the piston. Here's a link to your previous post, in case you've forgotten.

http://www.kwausa.co...219#entry108779

#5 netpoc

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Posted 05 April 2014 - 02:02 PM

77 degrees is optimum temperature for my guns. As long as you're using the correct lubricants, you should be getting around 2 full mags of bbs per gas fill.

#6 KeithHK

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Posted 05 April 2014 - 06:51 PM

Thanks jatodude. I didn't forget that post. I have actually done that to my rifle but the performance didn't improve much. So I asked my question again, looking for any more suggestions. I am sorry if I've caused any inconvenience but anyway, thanks for reminding me.

Thanks netpoc. Maybe I ought to charge my mags longer and lube mine again.

Edited by KeithHK, 05 April 2014 - 06:52 PM.


#7 Chuck S

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Posted 06 April 2014 - 04:04 AM

I charge LM4 magazines for 45 seconds.  You can't over fill them, you're injecting liquid into the magazine and it only holds so much.

-- Chuck

Edited by Chuck S, 06 April 2014 - 07:57 AM.


#8 General Pickle

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Posted 06 April 2014 - 10:24 AM

That doesn't sound anything like how my LM4 behaves around 70°F, though I am using dry Coleman propane at about 2000ft above sea level.

When charging my magazines I wait until I can no longer hear any gas transferring to the magazine. This can take anywhere between 10 and 45 seconds, depending on how much gas I had inside the magazine already. Given that I leave my magazines charged with gas I nearly never have to charge a magazine from empty, so I may not even remember how long it takes to fill the whole mag, hah!

This may seem like a stupid question, but are you certain that it's not HFC134A gas? Maybe it's labeled incorrectly? This could make a very big difference.

#9 KeithHK

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Posted 06 April 2014 - 03:39 PM

Thx Chuck S

View PostGeneral Pickle, on 06 April 2014 - 10:24 AM, said:

That doesn't sound anything like how my LM4 behaves around 70F, though I am using dry Coleman propane at about 2000ft above sea level.

When charging my magazines I wait until I can no longer hear any gas transferring to the magazine. This can take anywhere between 10 and 45 seconds, depending on how much gas I had inside the magazine already. Given that I leave my magazines charged with gas I nearly never have to charge a magazine from empty, so I may not even remember how long it takes to fill the whole mag, hah!

This may seem like a stupid question, but are you certain that it's not HFC134A gas? Maybe it's labeled incorrectly? This could make a very big difference.
Hi General Pickle. The gas I use is from guarder. I'm sure it is a kind of green gas.

Edited by KeithHK, 06 April 2014 - 04:11 PM.


#10 gcw360

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Posted 06 April 2014 - 03:48 PM

View PostKeithHK, on 06 April 2014 - 03:39 PM, said:

Thx Chuck S

Hi General Pickle. The gas I use is from guarder. I'm sure it is a kind of green gas.
Can you read the ingredients on the can and let us know?  Guarder sells more than one kind of gas and the one marked with HFC134a (CH2FCF3) is low lowered gas not appropriate for any KWA GBB gun.

#11 KeithHK

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Posted 06 April 2014 - 04:08 PM

View Postgcw360, on 06 April 2014 - 03:48 PM, said:

Can you read the ingredients on the can and let us know?  Guarder sells more than one kind of gas and the one marked with HFC134a (CH2FCF3) is low lowered gas not appropriate for any KWA GBB gun.

Sorry that the gas doesn't provide the ingredient on it but I have taken so photos of the gas.

Posted ImagePosted Image

Edited by KeithHK, 06 April 2014 - 04:10 PM.


#12 gcw360

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Posted 07 April 2014 - 11:25 AM

Well, it's pretty apparent it's green gas.  Perhaps you can try another can?  I have had times where one can works great and the other doesn't work well at all.




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