I will disagree with pathfinder and agree with Lucas, and put 2 cents of my own experience in here.. The shotgun is pointed not aimed, it has been around a few hundred years and perfected. Hitting birds going 60 mph is not going to happen with any kind of ghost ring sight. Nothing is faster than a bead, red dot sights are close but unreliable, unless you go with a milspec version like an aimpoint. If your primary goal is using slugs, then a front and rear sight system may be in order. But for defense, stick with the front sight only, bead, post or otherwise. The old remington buckhorn rear sight with a front bead is adjustable and not too bad, if you think your going to use slugs alot. I bought into the ghost ring thing many years ago, used it for a year and a half. I shoot tactical competition, and it slowed me way down. I shoot against one man who is very good and is a professional, with the ghost rings, ( and I tried Scattergun technologies, and the now AO versions ) good sighting systems but too slow. This man would beat me by 4 seconds in a tournament, and his protege by 2 seconds,, when I went back to a bone stock bead, it reversed, I beat him by 2 seconds, and his protoge by 4 seconds.. Lesson learned. I would recommend a good lighting system and a tritium bead for home defense. I was trained by a very good instructor from the MId South shooting institute who proved you could hit a piece of note book paper I think that is 8 1/2 x 11" at 50 yards on demand with a bead sight, and a cylinder bore shotgun which is issued to most law enforcement, and a bead front sight. It has worked for me.