I am using locktight on the gas block bolts, if that does not work I will stake their heads.
Might work if it's not rapid-fired. Otherwise the heat will soften the Loc-Tite and defeat its purpose.
Something worth remembering if you ever need to remove a screw that's been "Loc-Tited" in place. Touch the screw with a soldering iron for a bit and you can remove it easily.