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Best way to prevent jams


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#21 Rockhound117

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Posted 26 May 2013 - 05:24 PM

That sounds like a bad idea. Like Chuck said. There is no extractor. You're not pulling anything out of the chamber by racking the bolt, you're just pounding the bb's into the hop up unit and possibly making things worse, like deforming and tearing the bucking or the hop up unit itself.

#22 -wigs-

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Posted 27 May 2013 - 02:11 AM

Oh I'm aware. As I said I wouldn't recommend it and i had 3-4 jams tops in the beginning of the guns life months and months ago. Just a mid game aggravated brain fart that worked.

#23 SnowboardeR1298

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Posted 28 May 2013 - 08:40 PM

Still having problems with jams. Is it a pretty easily relatable problem with the piston oring or could it be more? It's really frustrating when it happens on almost every single magazine. Thanks for the help in advance!

#24 netpoc

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Posted 28 May 2013 - 08:51 PM

Clean the grease off of your bolt and other related areas.

#25 SnowboardeR1298

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Posted 29 May 2013 - 03:39 AM

View Postnetpoc, on 28 May 2013 - 08:51 PM, said:

Clean the grease off of your bolt and other related areas.

I have cleaned it many times with silicone oil provided by kwa. Anything else it could be?

#26 SnowboardeR1298

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Posted 29 May 2013 - 03:49 AM

It's like the bbs get stuck really tight in the loading ramp and hopup area. When this happens the mag vents all of it's gas. Idk if this is important or not but I have noticed that when I load one in the chamber it seems like the bolt isn't all the way forward...

#27 SnowboardeR1298

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Posted 29 May 2013 - 05:04 AM

Could it be because I have jammed the mag in too far?

#28 netpoc

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Posted 29 May 2013 - 06:05 AM

What bbs are you using?

#29 gcw360

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Posted 29 May 2013 - 06:29 AM

View Postnetpoc, on 29 May 2013 - 06:05 AM, said:

What bbs are you using?
And how many BBs are you loading?

#30 SnowboardeR1298

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Posted 29 May 2013 - 06:34 AM

I'm using elite force .25 g bbs but I'm switching to .30 biovals. I use the kwa speed loader and load it until I can't anymore and confirm that the last bb is on the left side when looking from the back of the mag. I shot mag that only had about 30 bbs and still had the same jam every time.

#31 SnowboardeR1298

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Posted 29 May 2013 - 07:08 AM

View PostBoobieM4H, on 22 May 2013 - 09:15 PM, said:

Stake the outer barrel to the hop up unit..over time the recoil will cause the hop up unit to move in a lateral motion in the outer..and cause jams. Staking the barrel to hop up unit will prevent this movement.  I've done this to countless lm4's..and NONE have came back to me with jamming issues.

( o Y o )

Could you either upload a picture or video demonstrating this?

#32 BoobieM4H

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Posted 29 May 2013 - 09:50 PM

View PostSnowboardeR1298, on 29 May 2013 - 07:08 AM, said:


Could you either upload a picture or video demonstrating this?
Sure..ill try to do it in a couple days.feeling under the weather right now with a cold..

( o Y o )



#33 FlagBonz

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Posted 11 June 2013 - 05:37 AM

First post.

I am having the same issue. Purchased my Magpul edition 1 week ago. The supplied magazine would eject with the mag release - caused a broken floor plate. I have 4 other mags that did not have that issue - but all 4 had the "double feed" as described above. After 1-2 shots I would get all gas expelled and the bolt not completely forward in battery. One bb in the chamber and a second bob on the feed ramp. Elite force .25 biodegrad bbs.

This is my first gbb rifle.

Must be the weapon since all 4 mags result in malfunction.

#34 JonathanNCP

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Posted 12 June 2013 - 09:13 AM

I had this problem recently when my hopup arm was too far down and prevented the bb from exiting the hop area and the bb's backed up.

#35 General Pickle

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Posted 12 June 2013 - 01:17 PM

I was having this issue a lot as well, however I just installed the EVO II unit and so far it has not happened once. Have you guys also had BB's roll out of your barrel? Mine used to do that as well but since I've had the EVO II installed it has not happened again. I really think those feeding issues are due to the crappy stock bucking not holding the BB's in place correctly. Aside from that all I've done is add the HNBR o-ring to the bolt and bent the bolt catch arm down a little bit, though now it seems that the bolt can lock back when I don't want it to. Perhaps I'll have to do the rest of the mod and drill the hole/move the spring to the other position.

#36 FlagBonz

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Posted 16 June 2013 - 06:17 AM

Well I figured out my problem. I had a split bb that somehow (got no idea how) that was stuck inside the bolt assembly. It was inside the space where the spring that holds the nozzle to the bolt is.......... I figured it out by comparing to another lm4 and I noticed that the bolt was not completely into battery - by about 3mm. It was preventing the two parts (nozzle and bolt) to fully come together.

Strange.




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