Looking for a shooting stocking stuffer? Maybe a little treat for your gunnery self? Try the Hi Viz Birdbuster Shotgun Sight for only $15 at Wal-Mart.
I researched quite a few sight enhancements like this, finally spending twice as much money ordering one that turned out to be too narrow, too long, and too dark, so I promptly returned it.
Then I found Hi Viz at local Wal-Mart. The Hi Viz system is everything a shotgun augmentation sight should be: inexpensive, easy to install, easy to fit whatever size shotgun rib, and easy to use any of four included tubes: green or red, round or triangle.
One of the three metal bracket widths included in each package should fit nicely, and three magnets ensure it will stay snug. I tried mine out today and it was perfect through a hundred shells.
Best of all, it's definitely more viZible and easier to point/aim with than the bead, which the Hi Viz snuggles up against and does not replace.