"HiViz M300 Magnetic front shotgun sight. This magnetic base, shotgun front sight fits ribs from .218"" to .328"" (7/32"" - 21/64"", or 5.5mm - 8.3mm). It comes with two red, and two green, fiber optic family LitePipes. It fits the Remington (All field models), Browning (Gold 10-gauge, BPS, Auto-5), Beretta (Comp., T & ST ribs, Pintail auto), Ruger (Red Label field guns), Ithaca (Model 37 and other models) Benelli (Super Black Eagle & all field guns), Franchi (Field guns). Four interchangeable, high intensity LitePipes are included with all M-series magnetic shotgun sites allowing the shooter to adjust to existing light conditions. They are not compatible with fiber or aluminum ribbed shotguns."