blopp220 Posted August 13, 2014 Report Share Posted August 13, 2014 I am finally getting close to finishing my 308 biuld! I know they are a different beast than it's little brother. I am having a 20 inch rifle length barrel cut down to 18 inches. I was wondering what people here have found to be a good size for the gas port diameter for an 18 inch rifle length barrel. Quote Link to comment Share on other sites More sharing options...
shibiwan Posted August 13, 2014 Report Share Posted August 13, 2014 (edited) Most (if not all) 308-ARs are already overgassed. Don't lose sleep over this. It's not worth the concern - your rifle will cycle properly as-is. Edited August 13, 2014 by shibiwan Quote Link to comment Share on other sites More sharing options...
washguy Posted August 13, 2014 Report Share Posted August 13, 2014 #42 and #44 drill bit size there abouts :) Washguy Quote Link to comment Share on other sites More sharing options...
blopp220 Posted August 13, 2014 Author Report Share Posted August 13, 2014 Thanks guys ! Quote Link to comment Share on other sites More sharing options...
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