AR15 barrel in stall. Use locktite?

[alberta tactical rifle]

i use red locktite (262) on the gas block set screws and have never had one back out.
Staking is overkill and is going to damage both the gas block and your set screws when/if you want to change things up or if you use it enough to shoot out the barrel.
Aeroshell is a great item to have to say you have it, but not need as there are plenty of other suitable substitutes.
To each their own though, whatever floats your boat.

this!!