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Bolt catch Issues

Lm4 bolt catch issues

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#1 Hudgat

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Posted 02 August 2012 - 01:36 PM

My bolt catch seems to have worn out very fast and no longer functions, are there any fixes to this?

Thanks for your help!

#2 Outlaw1995

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Posted 03 August 2012 - 12:26 PM

Hi Hudgat, welcome to the forums. Check the bolt face- especially the side where it comes into contact with the bolt lock. If the edge is dull, and rounded, you are going to need to file some material down to make it straight again so it will lock with the bolt lock.

#3 that guy with the m4

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Posted 08 August 2012 - 11:12 AM

we'll I have found that it is that the magazine. The spring gets weaker over time and what that's means is it will not interact with the bolt stop(it won't push up it) this has happen to me with all my pmags. So what I do to fix it is I take apart the mag and stretch the spring that feeds the bbs and should fix it tell me if it works

#4 Outlaw1995

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Posted 08 August 2012 - 11:20 AM

It can be a mixture of both. The magazine springs can get weak over time and fail to activate the bolt lock engagement lever, but if the bolt is worn out in the area I talked about, then it doesnt matter whether or not the bolt lock engages or not, because there won't be any material on the bolt to engage with. But yes, the magazine springs can also lead to a bolt catch failure.

#5 that guy with the m4

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Posted 09 August 2012 - 01:47 AM

yes you right I just thought that I would not have to say it again. And on a side topic are the bolt carriers made out of that weak of metal

#6 Outlaw1995

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Posted 09 August 2012 - 10:01 AM

 that guy with the m4, on 09 August 2012 - 01:47 AM, said:

yes you right I just thought that I would not have to say it again. And on a side topic are the bolt carriers made out of that weak of metal
The bolt is made of steel as advertised, but it does have a lighter metal on the outside I believe made specifically to help not wear out parts as fast. Think of it as an added durability bonus.

#7 that guy with the m4

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Posted 09 August 2012 - 11:17 AM

thanks

#8 MultipleParadox

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Posted 09 August 2012 - 02:30 PM

I'll ride on that thread instead of creating a new topic, as the title is appropriate:

All of a sudden my LM4 started to have its bolt lock engage after 2-4 shots of a new, full mag (the mag is not faulty, read below)

After a quick inspection I noticed the bolt lock on the receiver to have lost any kind of spring tension. I'm pretty sure I lost a spring, indeed.

But there also seems to be some friction  keeping the lock in the engaged or disengaged position, making a click between both positions.

I didn't disassembled anything yet, as I wanted to get some advices first

Thanks for your help

#9 kullwarrior

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Posted 09 August 2012 - 05:05 PM


Edited by kullwarrior, 10 August 2012 - 10:01 PM.


#10 MultipleParadox

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Posted 12 August 2012 - 07:22 AM

Thanks for the reply kull
Will look at that vid once I have my cable connection working again

#11 akiraspeedstar

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Posted 12 August 2012 - 12:57 PM

Have you ever previously (or someone else) taken the gun apart? What supplys tension is a plunger and plunger spring. This spring can easily be lost if you removed the impact block previously. If its never been opened then the only other option is that the spring has lost its strength or the plunger has shaved down.

#12 BoobieM4H

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Posted 12 August 2012 - 04:23 PM

Post up your how to vid akira..its a reallly good vid

Sent from my DROID2

#13 MultipleParadox

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Posted 17 August 2012 - 10:25 AM

Finally got to follow up on this;

I haven't opened it myself but maybe the previous owner did. I guess I didn't notice this issue before being on the field so either the spring is missing or weakened like said earlier.

So I watched all your vids (Kull, Akira and Boobie), pretty informational; I will do the mod, it seems to be a better solution all in all.

Thanks guys, your help is much appreciated!




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