I am always amazed in 2019 that people still do not know about dimpling barrels for gas block installation or people who constantly say "it's not necessary". This upper was recently sent to me after the owner noticed it was no longer working. It was home assembled and he had no idea that the barrel should be dimpled. The set screws had also not been Loctited, although both screws were tight when I removed them. One can clearly see how far the gas block shifted. According to the owner it had several hundreds of rounds through it until this happened.
I can say with almost 99% certainty, that a properly dimpled barrel, with correct set screws and Loctite will not come loose. I have tens of thousands of cumulative rounds through multiple uppers, and that doesn't include the multiple weapons that we have at SIONICS that are used in demos with tens of thousands of rounds through them.
Sadly there are manufacturer's doing this as well as using aluminum gas blocks on their uppers.
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