Loc-tite and gas block

[montana]

Have they? First I've heard of it in 30 years ('and years').

My opinion is that you should use glue sparingly on AR's. If you are worried about a loose seal, get a tighter fitting block that taps on with a hammer or clamps. If it leaks slightly and the system still functions it's probably a blessing that you're not having to cope with that excess pressure at the receiver. If you think glue on blocks improves accuracy ('for some reason') then I have no counter argument for you here. That one is a non sequitur.

Sorry mate but I have to call it when I see it. I won't lose any sleep if you want to use glue on your block seal or advise others accordingly but the only glue on my guns are gas block screws and sometimes handguard screws.

I have never had to use any glue on my gas blocks to seal them. They have functioned perfectly with out it. That said I can't see how it would do any harm if it doesnt get into the port. Something to think about for us anal types, I always used red loc-tite on my gas block screws. I wouldn't use blue loc-tite on my gas block screws because of the high heat being generated could render it useless.