I am putting a TROS 3 Lug Adapter on a 9mm AR pistol build so that I can use a suppressor I already have with the 3 Lug Mount.  I don't want the adapter unscrewing from the barrel and am looking at trying something different.

Has anyone used JB Weld ExtremeHeat as a threadlocker?  Their website says it is good up to 2400 degrees.  How did it work?

Or should I just stick with Rocksett?

I would stick with rockset. If you aren’t happy with that, you can always pin and weld it on.

Rocksette or green locktite. You could also use red locktite.

Rocksette is preferred