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M4 GBB WE burst randomly on semi.

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Old September 9th, 2019, 00:59   #1
Canuck113
 
Join Date: Sep 2019
M4 GBB WE burst randomly on semi.

Well so I bought this WE replica from a dude.

I opened it,painted it and cleaned it.

The only problem it has is that sometimes on semi it burst randomly then goes back to normal semi.

I removed the auto sear as it doesnt seem to change anything.
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Old September 9th, 2019, 01:02   #2
Canuck113
 
Join Date: Sep 2019
I dont know which gen it is as there is no engraving or anything.
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Old September 9th, 2019, 05:38   #3
Drake
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Location: Montreal, QC
Is it open bolt?

First thing to check is the o-ring on the gas piston. Remove the BCG, pull the piston forward and oil the o-ring at the back with pure silicone oil.

Also what kind of gas are you using? Is the bolt cycling all the way back? A weak (partial) cycle can give you a sloppy sort of burst. Do you have an NPAS installed?
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Old September 9th, 2019, 09:50   #4
Canuck113
 
Join Date: Sep 2019
Open bolt yeah.


Propane
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Old October 20th, 2019, 13:14   #5
Bigload
 
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Join Date: Jul 2012
Location: Stouffville
Try replacing the Sears.
Kyairsoft has the part.
A few bucks plus shipping

Replacing the Sears can be done by following some videos online
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