Unlike a ADM or LaRue mount that you must make work with a particular upper a Bobro mount adjusts itself to the upper where you're using it. All you do is tighten it down until the lever locks down. It self adjusts. With LaRue you need their wrench. With ADM you'll either need a bladed screwdriver (old models) or you'll take a minute or so to adjust the tension by hand. With Bobro all you do is install it and lock the lever down. Once on it's done, nothing else is required.................PURE GENIUS!