You know, the comments about Loctite breaking down under heat and oil interest me, because I've have a Loctite assembled piece on an AR for about 25 years now, and it's still going strong.
I built up a clone of the XM177E2 flash suppressor, by using one of the early style suppressors, that you can still get from Bushmaster, thinning and lengthening the rebate at the rear , and sliding an E2 diameter tube over the rebate section. The overlay was secured with green Loctite, which is (was?) the industrial grade.
Now in 25 years the thing has seen more than it's share of lube, including at the seam of the overlay, and a pretty fair amount of heat, especially from muzzle blast on the inside of the brake, and it's still going strong.
Maybe it's the fact that it was the industrial geade stuff, or maybe early Loctite was more heat resistant? Oh well, just hope it stays together for another 25 years[:D]