New build running dirty

[brian y]

Dirty brass means extra back pressure on extraction. You're running a 24" barrel, it's likely to be a dirty girl forever. An adjustable gas block isn't going to reduce your plug time, which is where your extra chamber pressure comes from. The BCG is opening before the gasses have vented at the muzzle.

Wet tumble is your friend B.

Thanks for the answer it confirms what I thought, I do not reload I sell on and I do not like selling dirty brass, Looks like I will need to buy a tumbler.