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If your "Cleaning Process" involves submerging the parts in harsh solvents then that pretty much rules out any chemical based thread locker. Your only option will be a mechanical solution such as a set screw or something like that. If I was in your boat I would drill and tap the comp with a 5-40 or 6-40 thread then put a deep dimple in the mating surface of the barrel threads. Doing this would allow you to use a fairly stout set screw so you can put some decent tightening torque on it and the deep dimple would retain the clock timing of the comp on the barrel. A cross drilled hole with roll pin would also achieve the same result, but would probably be a lot harder to do without a mill. That and roll pins like to work out over time which creates another fun issue to deal with. A cross drilled threaded hole with a long set screw would probably be the most solid solution, but you are not doing that kind of stuff without spending serious $$$ for a machine shop to do it.
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Since your not planning on removing the barrel you could go with green locktite 680 or 609.
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I use MP Pro-7 cleaner and lube. I would most likely use a taper pin if I were to pin it in place. Bumping up to a larger set screw seems like the most reasonable course of action and is something I can do myself.
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Given the passivated Glock barrel and anodized brake, it could well be that there aren't enough stray metallic ions to catalyze Loctite. Have you found that Loctite solidifies?
