Yes, you need to have it drilled and tapped. - XS Sight Systems Shotrail, Ghost Ring & Standard Dot Tritium Shotgun Sights, Mossberg

Purchased years ago and put through occasional use. The front sight isn't really needed or useful unless using slugs. The ghost ring helps more, even with a simple bead front, at keeping your shot patterns lower since Mossbergs tend to shoot high naturally.