I have the chrome moly version of the Double Star/J&T Distributing heavy profile 16 inch 6.5 Grendel barrel. I have never measured the gas port on my barrel but have considered buying an adjustable gas bolt carrier like Bootleg. I have been very pleased with the accuracy of my DS/J&T barrel. I bought my J&T 16 inch 6.5 Grendel kit to match my duty 5.56/223 AR-15. Other than being a little over gassed I like my J&T upper. My barrel functions fine on factory ammo but is over gassed on a couple of my hand loads.
https://www.brownells.com/rifle-parts/bo...05111.aspx
https://www.brownells.com/rifle-parts/bo...05111.aspx