It works as described...however, I couldn't get it to stay in the same position. There are several adjustment areas with thumbscrews/allen bolts, etc.... I was very inconsistent with it and found that it was because it kept moving (not a lot, but enough to cause an erratic shot pattern of 3-4 inches at 20yds). Ditched it and went with a peep and am shooting great now! I think if yu can get it to not move after it's set, it would work really well.