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.308 ar barrel question


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I have a old Knights 308 match sr25 with a 24" barrel. I am going to chop the barrel between 16" and 17". I measure the gas port at .090", it is rifle length.

My question is what size gas port is going to give me the best results? Should I open it up or keep it the same?

At this point I have a Surefire break I plan on using.



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