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With the amount of heat that builds up around there, would the Locktite even do anything ?
Agreed. If you could hear when firing, once it got hot enough you would hear the loctite crackling as its bond breaks. Useless.
most semi auto ARs will not get hot enough to loosen the loctite on a barrel nut. And if it does get soft, it hardens back up once it cools. I've seen enough red loctite on barrel nuts to know it it holds tight. If you want loctite on your barrel nut go ahead, it is not useless.
Typically used Loctite 262:
300F for 50% strength, 450F or so to break loose. Barrel nut or quad rail is most likely to loosen while firing (twisting, etc.).
Depends on how hard you run your guns, but IMO, no substitute for proper torquing of the barrel nut.
I would certainly not recommend people following proper torquing specs to use it, YMMV.
ETA: I do like my Noveske uppers though, and a couple Young N/M BCG's, loctite and all.