Re: AR-15 gas block?
While I do agree with the above reply, having used both types I would go with the clamp on type.
The clamp on type is easier install, less possible troubles and less trouble to remove and reassemble later.
Even assembled correctly I have seen the set screw type move forward from firing. When it moves enough it blocks of the gas system and you have a single shot. To fix this problem I drill dimples in the barrel for the set screws so it can't move. More work.
Loc-Tite...barrel gets hot from firing. Heat loosens Loc-Tite. Rockset is a better choice since it's not effected by heat.
“There will be a revolution in this country!”
“I don’t believe people should to be able to own guns.”
"Stand your ground. Don't fire unless fired upon, but if they mean to have a war let it begin here."
~Captain John Parker, to his Minute Men on Lexington Green, April 19, 1775.