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Bolt Carrier Group Issues - Part 89


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#1 R_King91303

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Posted 11 June 2012 - 11:35 AM

I'd like to give a big thank you to all the KWA staff for their prompt assistance with repairing my LM4, the entire process took just a week from when I first sent it in, and when I recieved it (today).

It indeed appears that issue I was encountering with the BCG was being caused by part 89, what caused the issue with part 89 to begin with, is still not clear; I would not be surprised if it was related to over loading the magazine.

The first sign I may be encountering problems with the BCG was that the BCG was pushing slightly into the buffer, which was not allowing me to open the reciever by just pushing the rear pin; I had to push in both pins and then pull apart the receivers. Additionally, although the gun appeared to be cycling correctly there was a slight drop off in range efficiency; probably due to loss of gas pressure from the piston not extending fully into the chamber. The cause of these two problems now looks to have been caused by part 89 coming loose and lodging itself in the charging handle rail.

Part 89 as it should look like (centered in the pic):
Posted Image

Charging handle rail as it should look like (directly left of the hop-up assembly [after KWA repair]):
Posted Image

Part 89 lodged in the charging handle rail (before KWA repair):
Posted Image



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#2 Outlaw1995

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Posted 11 June 2012 - 01:47 PM

My gun experienced the same problem... hopefully this issue will be resolved in the next batch.

#3 Boss302

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Posted 11 June 2012 - 05:45 PM

Is part #89 something to be concerned about?

#4 R_King91303

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Posted 11 June 2012 - 05:56 PM

View PostBoss302, on 11 June 2012 - 05:45 PM, said:

Is part #89 something to be concerned about?

Well besides its potential of coming loose and impacting functionality of the BCG, it also help secures the top rail to the upper. I am wondering if a small application of an adhesive or epoxy such as JB Weld to the underside of the clip would help secure it to the receiver as a poor mans fix if it becomes loose.


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#5 niko_gpsy

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Posted 12 June 2012 - 04:45 AM

View PostR_King91303, on 11 June 2012 - 05:56 PM, said:

Well besides its potential of coming loose and impacting functionality of the BCG, it also help secures the top rail to the upper. I am wondering if a small application of an adhesive or epoxy such as JB Weld to the underside of the clip would help secure it to the receiver as a poor mans fix if it becomes loose.


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Be careful with using adhesives.  It can cause more problems is it overflows.

#6 R_King91303

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Posted 12 June 2012 - 05:54 AM

Yea I am aware of that, I was just thinking aloud for when my warranty is up; if I went that route I'd go with spot applications.


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