For guns that I'm trying to squeeze all the accuracy I can out of I use green Loc-Tite to bed the block to the bbl (it keeps the rounds from stringing in between distances) and I red Loc-Tite the bbl to the upper receiver. I also use red Loc-Tite or Rocksett on the set screws after dimpling as least the rear one into the barrel a tiny bit (at least 1/8" on a .750" bbl). When it's an option I prefer to cutdown the FSB and make it fit under a FF tube or rail as a pinned gas block is the most reliable (and use green Loc-Tite to bed it and use a tiny bit on the pins).
I use a small strap wrench from Brownells.
Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
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