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Old 07-09-2014, 11:38 PM   #1 (permalink)
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g4 leak

Got a g4 it just blows air out the barrel. Any help?
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Old 07-09-2014, 11:56 PM   #2 (permalink)
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I'd start by replacing the o-rings on the bolt and cap.
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Old 07-10-2014, 12:09 AM   #3 (permalink)
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Did that still think t may be playing with a blown noid
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Old 07-10-2014, 01:04 AM   #4 (permalink)
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There may be an o-ring on the inside of the body near the feed as well. I see it in the manual but I've never done anything with it on my g3s. From what I know barrel leaks are usually the orings in the bolt area / plug / back cap. I'd also clean off all the lube and try a very light amount mixed with some pb gun oil.

Does it chuff or try to shoot when you pull the trigger?
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Old 07-10-2014, 01:41 AM   #5 (permalink)
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Does it hold te bolt back and leak or does the bolt fly forward? Te g4 has orings in the body that go around the bolt instead of on te bolt itself. If te bolt stays back it is one of those. If it flies forward try cleaning the noid. Easily done and you might just have a piece of gunk in it. Those noids take a lot of pressure to blow.
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Old 07-10-2014, 04:30 AM   #6 (permalink)
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I will check all that once my buddy gets it back to me. I think the bolt moves forward but its been months since I've messed with it. Thanks guys
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Old 07-10-2014, 04:32 AM   #7 (permalink)
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But it could be the other i just can't remember
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Old 11-04-2019, 12:53 PM   #8 (permalink)
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If it flies forward try cleaning the noid. Easily done and you might just have a piece of gunk in it. Those noids take a lot of pressure to blow.
I have this issue (on a G4) where air gushes down the barrel, out the front of the bolt and the bolt blasts forward as soon as aired up... Is there anything I can try before cleaning the noid?
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Old 11-04-2019, 01:31 PM   #9 (permalink)
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I have this issue (on a G4) where air gushes down the barrel, out the front of the bolt and the bolt blasts forward as soon as aired up... Is there anything I can try before cleaning the noid?
Check the oring inside the breach near the front of the bolt face. If this is missing or cut it will not allow the bolt to hold back when airing up. Your noid might be fine. One way to diagnose if it is your breach oring is to put something like a squeegee against the bolt face and hold on tight when you air it up to hold the bolt back. If it is leaking through the face of the bolt at that point you most likely have a bad breach oring. If you replace the breach oring and it still leaks out of the barrel change out the bolt guide oring. After changing those you should have no leaks while holding the bolt back. Air it down then air back up without holding the bolt back. If it goes forward try firing the gun a few times to see if the noid unsticks. If not you're noid has something in it and needs service/replacement. Luckily the g series has the cheapest noid out there at about $25 usually.
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Old 11-05-2019, 10:43 AM   #10 (permalink)
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@Dano - Thank you sir. I tried the holding the bolt in place with a squeegee and when I aired it up the problem persisted. When I removed the squeegee, that breach o-ring was on the squeegee... I'll need to make sure I'm putting the right o-ring in there. So far I have just been eye balling it and pulling the closest o-ring out of the parts kit that came with the gun.
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