Doesn't hold tightly - Real Avid Lug-Lok Upper Vise Block

Had to use a 2' cheater pipe on my breaker bar to remove a barrel nut all that force and this thing didn't even Mar or disform in any way it is strong! The down side is it doesn't fit snug in the barrel extension lugs. I only use it to torque barrel nuts for everything else I use a receiver block that pins to the receiver.