I dunno, I just use aeroshell 33ms because somewhere along the way I read that it met the standards that the military intended for putting barrel nuts on stoner pattern rifles.
I spent 12 bux or so on a little tub of the stuff, have used it for a handful of ARs. I feel like I'll never going to run out. I kind of just dip every pin/spring in it before I install... I mean, steel springs, steel pins, aluminum channels... kind of the same deal?