like david said....take the one cover screw off the side of your alpha..screw in the nipple for the cyclone ..attach the 1/16 hose..clip the feed in ..done,,SYclops mentioned the tac caps which would make your line of sight even better...but all depends on what sights you use...reflex sights are fairly small and skinny...acogs and eotechs are a bit more bulky in size