As a non-vetted hobbyist, I just used about ten different tools to disassemble an upper for a barrel swap without damaging anything. I damaged something in the past and learned from it. I'm not being paid to put rifles together, so time isn't money for me. I can take my time and make sure I do things right.
Relevant to this thread, the gas block set screws were knurled cup point screws installed with Loctite 271. About 15 seconds with a wood burner touching the screw is enough to heat up the threadlocker where it is easy to break the bond. Even though the barrel had seen enough rounds suppressed to heat up the handguard to the point you had to wear a thick glove, the Loctite held strong when cooled. Heating it up is enough to weaken it, but it will still hold enough to prevent vibration. If it's a concern, use Rocksett or the new high temp stuff from Vibratite.
That was my point earlier Dave. You show just how easy it is to release the Loctite with the wood burner. So what good is the Locktite 271 if your barrel and GB heat up to 400 or 500F from an extended firing session or a firefight? When you need the Locktite to perform (extreme heat and vibration), it fails. Locktite 271 is rated full strength by Henkel to 300F. 300F + would not be hard to reach on a 556 pistol, much less a suppressed 556 pistol.
I think Rocksett is a better choice. Unless you are assembling an AR knowing full well it's no good for a 30 minute + sustained firefight. Or could become questionable. My Geissele 556 Super Duty pistol has the 2 setscrews and a roll pin installed in the GB/barrel. And those two setscrews have a white paint stripe marking their lack of movement.