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M4 airleak problem

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2 replies to this topic

#1 (HKG) MaRttIn :)

(HKG) MaRttIn :)

Posted 05 January 2018 - 09:19 AM

Hi everybody,


I have been assembling my M4 together these days and it is shooting at a very low fps. 


First I tested my gun with a method I came up with on the internet, but I don't know if it is a reliable way to show that whether my gun has an airleak problem or not so please take a look! 



And if this is the case, is it because of my air nozzle or tappet plate? (Hop up had been reinstalled several times and should not be the main problem)


Thanks for the help!



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#2 Hellion_Blade

  • Gender:Male
  • Location:Greensburg, IN

Posted 05 January 2018 - 09:58 AM

So your paper method just means you have an air leak. first I would check the air nozzle for movement. when you cycle the gun, look into the hop up chamber. the nozzle should poke forward to seal against the hop up packing.

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Double Eagle M3 Trishot
KJ Works P229

#3 (HKG) MaRttIn :)

(HKG) MaRttIn :)

Posted 05 January 2018 - 09:39 PM

I checked the air nozzle movement and it seems alright.
I shoot the gun in full auto, and stop it when the piston reaches the very back. I then connect in to the hop up and look into the chamber and I see that the nozzle is touching the lip of the hop up bucking. Thanks Hellion!
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