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Why does the barrel move?


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#1 kwaispro727

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Posted 16 May 2014 - 05:04 AM

Why does the LM4 inner barrel move inside the outer?  I'm fairly sure this is the problem to my chronic jamming now.  I'll get around to the o-ring mod or some version of it eventually.  Does the barrel need to move?  Otherwise I'll just put a spacer on the barrel to hold it in place instead of messing with the dremel and o-ring.

#2 Chuck S

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Posted 16 May 2014 - 09:59 AM

My stock LM4 inner barrel does not move.

-- Chuck

#3 General Pickle

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Posted 16 May 2014 - 11:11 AM

View Postkwaispro727, on 16 May 2014 - 05:04 AM, said:

Why does the LM4 inner barrel move inside the outer?  I'm fairly sure this is the problem to my chronic jamming now.  I'll get around to the o-ring mod or some version of it eventually.  Does the barrel need to move?  Otherwise I'll just put a spacer on the barrel to hold it in place instead of messing with the dremel and o-ring.
Ideally the part which is secured to the outer barrel is supposed to be tight enough that the inner barrel cannot move around, but the recoil has different plans and causes slight movement when firing. This movement causes the barrel to shift, thus moving the feed ramps out of position and that seems to cause the double feeds. The o-ring mod helps keep the full assembly around the inner barrel in one place, thus preventing the malfunctions in most cases. Apparently Chuck has a magical gun from Zeus himself which never jams, breaks, misses, or otherwise has problems.

#4 Chuck S

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Posted 16 May 2014 - 03:08 PM

My sample of one (1).  I just tried (again) to physically move the inner barrel but it won't move.

Actually I had double feed and broken BBs with this LM4 when new, but after Mike at KWA Zeus himself on Mount Olympus worked on it she's been trouble free.  Keep in mind this gun doesn't get banged around much as it's a stand-in for my 5.56mm M4 Carbine and and shooting is largely confined to scaled targets and chasing White-tails out of the the family compound before they're torn apart by the four fearless -- to the point of stupidity -- miniature Dachshunds.  You guys who game them can easily have different experiences and moving barrels.  But it ain't supposed to move.

-- Chuck

#5 gcw360

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Posted 16 May 2014 - 06:47 PM

Funny thing is, Mike at KWA told me the barrel is supposed to move.....I'm getting a definitive answer live ans in person this coming week when I visit them in CA for LCXIII.  Stay tuned.

#6 BoobieM4H

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Posted 16 May 2014 - 07:25 PM

View Postgcw360, on 16 May 2014 - 06:47 PM, said:

Funny thing is, Mike at KWA told me the barrel is supposed to move.....I'm getting a definitive answer live ans in person this coming week when I visit them in CA for LCXIII.  Stay tuned.
Whoa...really? Its SUPPOSE to move? Id like to hear the explaination for that.

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#7 gcw360

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Posted 17 May 2014 - 06:25 AM

View PostBoobieM4H, on 16 May 2014 - 07:25 PM, said:

Whoa...really? Its SUPPOSE to move? Id like to hear the explaination for that.

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Hi Boobie...glad to see you on the Forums. That's what I was told....and I will find out why or if that's even really the case.

#8 BoobieM4H

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Posted 17 May 2014 - 06:28 AM

View Postgcw360, on 17 May 2014 - 06:25 AM, said:

Hi Boobie...glad to see you on the Forums. That's what I was told....and I will find out why or if that's even really the case.
what up! Yea if you could get us an explanation that would be great.  Thanks!

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#9 Jatodude

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Posted 17 May 2014 - 02:43 PM

The brass barrel spacer that the set screws go into doesn't seem to move at all. The clip that secures the hop-up round to the chamber, and the hop-up system seem to be kind of loose within the outer barrel. I was getting feeding problems, double feeds, etc. I took a piece of paper tower, about .5cm by 1.5cm, and wrapped it around the inner barrel between the brass spacer and the plastic clip, then pushed the hop-up chamber in very tightly. The inner and hop-up feels really solid, and now I can empty mags without a hiccup. I took the paper towel out again, and there was feeding issues. Put it back in, and it shot perfectly. I've repeated this several times with the same results. I don't know if it's a fluke, but it's a ridiculously easy fix for me.

#10 BoobieM4H

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Posted 17 May 2014 - 08:27 PM

Any possible way to stabilize the inner feom moving around in the hop up unit will help. There have been several different ways, and people are just trying what works for them.  

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