How difficult is this to install? — 1 Answer

Not difficult; you will need either a receiver block that can accept a standard AR [15] receiver or a reaction rod, one end of which inserts in the barrel extension [star chamber] and the other end in a vice [a steel vice, at least 4", needed for either tool]; remove the flash hider [if already installed on the barrel] with a thin profile wrench, and add this along with either a 5/8 X 24 crush washer or jam nut; also be sure to use a modest amount of Aero Shell or similar anti seize grease to insure that the threads do not gall. This particular muzzle device is uniformly ported so you do not need to concerns yourself with its positioning or "indexing" in relation to the barrel.