Lil guidance would be great.

[MikedaddyH]

What is the size of the gas port hole ?

It looks small in comparison to the mark on the barrel.

Get some drill bits out and find out. Humor me ! I think this might be the problem.

[psdmedic]

What is the size of the gas port hole ?

It looks small in comparison to the mark on the barrel.

Get some drill bits out and find out. Humor me ! I think this might be the problem.

idk i can sure find out

 

[MikedaddyH]

 

Get some drill bits and drop them in the hole... Until you find something close.

The gas tube should be between .110" and .120" diameter on the inside... My guess is that the gas port hole you have is around 0.068" to 0.076" and can be opened up a little more to help ejection.

 

 

[washguy]

I have all of my middy gas port openings at .086 ...about a #44 #45? drill bit... seems to be the sweet spot for my 16/18" barrels with middy gas port       Wash

[survivalshop]

 I say ,whoa ! That extractor set up can cause issues because it has too much tension on the fired Case & may not let it go properly , its a timing thing , if it holds on too long or lets go too early , it will have an issue & I doesn't matter who built it or round count .

 I would replace both the Ejector & Extractor & corresponding springs , you can try one system at a time & see if it works , but I would have both system components on hand , just so they are available . I would change out the Extractor assembly first , but I have seen an Ejector system do the same thing you are describing .

No Idea why someone would put two O-rings on the Extractor , sounds like a band-aid to cover a real issue . 

Also look into what others here are describing , your issue may be multiple components or miss matched or out of spec. issue.

Edited January 11, 2016 by survivalshop

[washguy]

PS on the oring deal...never get in your mind that because its from the factory then its right....nope mostly you got low wage dunderheads putting them together...so rule out just because its factory       Wash

[psdmedic]

 I say ,whoa ! That extractor set up can cause issues because it has too much tension on the fired Case & may not let it go properly , its a timing thing , if it holds on too long or lets go too early , it will have an issue & I doesn't matter who built it or round count .

 I would replace both the Ejector & Extractor & corresponding springs , you can try one system at a time & see if it works , but I would have both system components on hand , just so they are available . I would change out the Extractor assembly first , but I have seen an Ejector system do the same thing you are describing .

No Idea why someone would put two O-rings on the Extractor , sounds like a band-aid to cover a real issue . 

Also look into what others here are describing , your issue may be multiple components or miss matched or out of spec. issue.

It came that way from Aero

[psdmedic]

just got home havent had chance to  check the gas hole but I will tomorrow. Thanks guys.

[survivalshop]

It came that way from Aero

    That doesn't mean its correct or will help it function correctly .

    I have three 308AR's & none of them have an O-ring in them & they all work fine . I had Extraction/Ejection issues with a particular Bolt in my newest 18" build , If you want to read about what I went through with the new D.Wilson Bolt ,go to 308 Parts section & look for D.Wilson Bolts . The Bolt just didn't like the new 18" barrel I had it in , the Bolt works fine in my other 308AR's , I think the Barrel /Bolt fitment was just not compatible . Head Spaced fine in all Barrels , the D.Wilson Bolt is working fine in my 16" Rifle & the 16"'s Bolt , works fine in the new build 18" . Both Bolts were new , so it wasn't a big deal to swap them out . Normally I would not swap Bolts that have been seated in a Particular Barrel .

 Its a good read on how little it takes for a  Extraction /Ejection  issue from a Bolt .