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The HiViz M500 Magnetic Base Front Shotgun Sight fits ribs from .437" to .578" (7/16" -37/64", or 11.1mm-14.6mm). It includes four extra fiber optic family LitePipes (two green, two red). The sight is made to fit the Beretta (Silver Pigeon, Gold and Onyx Sporting), Browning (GTI), Ithaca/SKB (Trap and Sporting Clays), Kreighoff (K-80 International Skeet) and the Remington (1100 Target).