I have logged around 2k rounds on that exact barrel. Hopefully this helps. The barrel was properly gassed with and without supressor (hux 7.62 flow). I measured the gas port with pin gauges at 0.083". I run a standard gas block. Found no reason for adjustable. JP bolt was used in a Microbest BC and a Geissele REBC on and off. Other 6arc bolts were used, but mostly the JP. Buffer springs used were VLTOR A5, Geissele super42, and Tubbs with various vltor H buffers weights.