Looking to upgrade a T3x. I was looking at my barrel options. Seems like preferred barrels has good stuff. One option was threading, which which I want for a suppressor. Looks like they only offer class 2A threading. Competitor barrel makers offer 3A. Is 2A acceptable for suppressors? Assume it might be, but don't want to spend >700 on an assumption. Also looking at criterion, PVA (which does 3A). No where near made up my mind yet.