I'll admit it's the cheapest.....but having used the hammer punch on a couple of my M&Ps I'm not buying the "easiest". The S&W guys put those sights on like they mean it....Also a sight pusher makes it much, much easier to make small incremental changes when sighting in. Try as I might, I always seemed to either not "whack enough" or "whack to hard" when adjusting with a brass punch. Sight pusher I can actually calculate based on screw pitch and required sight movement.Easiest/cheapest. Brass punch and hammer. Never let me down.