You might need to go up a gas setting or drill out the gas settings a bit larger die to the reduced dwell time
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I don't know that anyone else has been posting to the stickied thread on port sizes. And...the ports are different for a Type 3 vs. Type 1 system (Type 2 I'd wager too).
In short, I'd be surprised if a 12" and 16" don't have different port sizes.
I think I listed my 11" 6.5G bbl port sizes in the stickied thread, but it's not applicable to a 5.56.....don't know that there's any 12" data.
XCR Factory (and Custom) Port Specs
This information is MOSTLY for Type 1 Gas Systems. It may be applicable to Type 3 as well in terms of sizing to get you in the ballpark, but I have NO IDEA if that's the case. It's just a guess. ***EDIT*** I've started including some Type 3 dial size info as well**** XCR Factory Bbl...
www.xcrforum.com
*EDIT I did note some Type 1 data on a 6.8 12" bbl.....but that's not really relevant to a 5.56 12".
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