From what I have been told by a reputable AR smith when I asked a similar question...the barrel extension to bolt fit is critical. .015" tolerance. As well as a clamp on gas block and best barrel you can afford.
I have spoken with q bunch of people who always fridge at the thought of clamp on gas blocks.
I run the JP on mine without a single issue but I have checked to make sure it stays tight also.
Never has needed more torqe on the bolt even after thousands of rounds.
My WOA with matching bolt shoots 1/2 MOA and was priced much lower than most barrels I looked at.