I just put a MI 2 piece free float hand guard on my AR Tuesday. Installation requires cutting the delta ring, spring pact, and spring clip off the barrel nut. Super easy to do with a dremel tool and cutting disk. Took me all of 10 minutes to cut and remove all three. There is a YouTube video on how to do it.
Then put the two halves together and tighten 6 allenhead screws. There are two anti-rotation tabs on the bottom half of the rail assembly that fit along side of the receiver. Once the hand guards are tightened down there is NO movement of the hand guard. Very high quality assembly, I highly recommend it.