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Barrel Gas Port Size,308/338/260/243 etc.


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10 hours ago, 98Z5V said:

 

Needs a 0.090" gas port diameter - or very, very damn close to that.

Outstanding! Thanks, for the help. I was going post my troubles in another category.  I didn't want to clog up an info thread.

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51 minutes ago, Leaflike92 said:

Criterion Barrel, SS Nitrided, .308, 16" barrel, rifle length gas, 15.25" tube, .094 gas port that is ~3.03" inches from center of hole to end of the barrel. Wanting to reliably run m80 ball. First post.

What is your gas block journal diameter?  What size gas block is needed?  Doubt it's 0.625", but it could be 0.750", 0.875", or 0.936".

Back in the day, when it was Kreiger/Criterion, they made that profile barrel custom for Fulton Armory, it used a 0.936" gas block journal, because it needed a 0.105" gas port.

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7 minutes ago, Leaflike92 said:

It's .750 diameter. Was planning on putting a Wojtek click adjustable block on.

You can try that gas port size out, but I'm pretty positive that it's going to be too small, and you'll need to go up.

Start a new thread on the build section, on your gun specifics, and go from there.  No sense cluttering this thread up with the data, that may or may not be useful to this thread in the future.

Edited by 98Z5V
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1 minute ago, 98Z5V said:

You can try that gas port size out, but I'm pretty positive that it's going to be too small, and you'll need to go up.

Thank you for the response, I've been reading though the forums a lot recently and it's clear to me that you are the community expert when it comes to things like this. I had the same hunch that it would likely be too small based on what I've read about manufacturers drilling these ports too small.

 

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