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LM4 PTS Double feeding


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#1 Rafael Raygoza

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Posted 15 March 2014 - 08:10 PM

So i recently ran into the infamous "double feeding issue" with my LM4 and im pretty desperate since its the main gun that i love to use. I did the mod to where i dremeled and c clipped the barrel to where it wont move around as im firing the rifle, but i am still getting the double feeding issue. However, when i load a fully loaded pmag the gun can fire off all of the bb's without a hitch (maybe since the magazine sits higher in the magwell?). When i load a full stanag magazine i then get a double feed every 3-4 shots. Ive replaced the bucking, housing, got a new BCG, used the stock parts and no imrpovements whatsoever.

Now would it be possible (if all else fails) to send in the rifle to KWA for repairs? knowing that its a PTS Magpul edition LM4 i was curious if you would even service the rifle.

#2 Fox Weik

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Posted 16 March 2014 - 06:25 PM

are your stanag feed lips damaged? have you tried it with other stanag mags? also cleaning never hurts

#3 Rafael Raygoza

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Posted 17 March 2014 - 12:11 AM

No, Yes, Cleaned after every game. I have 12 Stanag (6 brand new) and 4 pmags (i baby these so no major wear) and they're all in very good condition. I'm going to take apart the whole upper receiver and try to figure out where the jam happens. Maybe even polish the loading ramp while im at it. Hopefully i can spot the issue

Edited by Rafael Raygoza, 17 March 2014 - 12:12 AM.


#4 Shaggy

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Posted 17 March 2014 - 06:52 AM

I'm having the same issue with mine I did the e-clip mod mod to I have 11 stang mags used most of them for the first time the other day and was getting a jam about every 5 to 10 shots on a fully loaded mag shooting on semi but when I shoot full auto it will shoot every round so If you find the issue I would love to hear about it

#5 General Pickle

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Posted 17 March 2014 - 09:23 AM

Have you upgraded to the EVO II and Maple leaf bucking? I found that with my stock bucking and tensioner arm there was not enough pressure to hold the BB's in place, so the BB's would just roll out of the barrel when I pointed the rifle at the ground, but this also leads me to believe that the BB's could potentially fall back into the chamber somehow and jam up. I got the EVO II set up and noticed a huge decrease in double feeds, then I did the o-ring mod and essentially haven't experienced any double feeds since then.

#6 Shaggy

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Posted 17 March 2014 - 10:29 AM

I have the EVO II & Maple Leaf bucking with the results I said above

#7 General Pickle

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Posted 17 March 2014 - 05:58 PM

View PostShaggy, on 17 March 2014 - 10:29 AM, said:

I have the EVO II & Maple Leaf bucking with the results I said above
I would double check your o-ring mod, as I remember the first time I tried it the groove was not deep enough so the ring(or clip in your case) was able to get pushed just like the assembly. Also, do you know if they are KWA magazines or KSC magazines? I think some people here found there's a difference between the feed lips on either version. I believe the KWA's had a straight edge where the BB's leave the magazine and the KSC's have a rounded edge. Here's the topic for reference: http://www.kwausa.co...&hl=+feed +lips

Perhaps it doesn't address KSC vs KWA specifically, but either way it may be a factor which is attributing to the failures,

Could you snap some pictures of the inside of the gun/magazines? That might help us narrow it down a little bit.

#8 Shaggy

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Posted 17 March 2014 - 10:40 PM

I want to say sorry to Rafael Raygoza for kinda stealing your thread. I just checked all of my mags and they all have the rounded feed lips including the one that came with my gun and the other 10 came in KWA packaging

#9 General Pickle

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Posted 18 March 2014 - 01:03 PM

View PostShaggy, on 17 March 2014 - 10:40 PM, said:

I want to say sorry to Rafael Raygoza for kinda stealing your thread. I just checked all of my mags and they all have the rounded feed lips including the one that came with my gun and the other 10 came in KWA packaging
One way or another we're all trying to help each other solve issues, so maybe by helping find solutions to yours we may accidentally solve his as well! Multitasking! That's interesting that you have the round lips, as I only have 4 PMags currently and they all have straight lips. See if you can get a friend to let you use a mag with straight lips for a while and if there's a noticeable difference in the frequency of jams that may be the issue. If all of this and the above fails to get a result I'm sort of at a loss. Maybe the loading nozzle? Feed ramp issue? If all else fails you could send it to KWA for service, though it wouldn't be in warranty so you'll have to pay for parts and labor.

#10 Shaggy

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Posted 18 March 2014 - 03:41 PM

Unfortunately I'm the only one with an LM4 that I play with I will order some new feed lips to see if that helps I will report back with my findings thanks for the help

#11 Rafael Raygoza

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Posted 18 March 2014 - 09:53 PM

Thats what i'm trying to figure out General Pickle. Since my LM4 is a magpul edition if they can service it even if i dont mind paying.

#12 General Pickle

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Posted 19 March 2014 - 12:11 AM

View PostRafael Raygoza, on 18 March 2014 - 09:53 PM, said:

Thats what i'm trying to figure out General Pickle. Since my LM4 is a magpul edition if they can service it even if i dont mind paying.
I don't see any reason why they wouldn't do it, though if the Magpul lower was broken for some reason maybe they wouldn't be able to replace that or the other Magpul parts. As for core components it shouldn't be an issue. Give the pro shop a call and ask them about it, as they'll probably give you all the information you need. I too have the PTS version, so if you find the answer for certain be sure to let us know. Good luck!




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