Shot 1st round in our first barrel chambered in 300aac

[Dane Armory]

Finally got to working on 300 aac barrels. Test fired one round today.brass looked clean with no scratches or lines. Green mountain 16 inch 1=8 twist blanks.

Can I get gas port sizes for carbine gas system ?

[98Z5V]

I can pull my upper apart next week, brother.  16" with carbine gas.  I'll measure the gas port diameter.