I have seen a couple of places where Criterion Barrels recommends you clean your receiver and barrel sleeve to dry with a degreaser, then heat receiver threads with a torch for several minutes and then apply Loctite 609 Retaining Compound to the barrel sleeve liberally and insert and let cool. The thought being that the Retaining Compound expands and hardens on fast and you never get any barrel shift, etc.

Is this common and I have missed this all these years or is this a Criterion thing?

What does everyone else use on barrel sleeve for your builds? Anti-seaze? Lube? Dry? Retaining Compound with or without heat? What?