Hiviz S300R: The S-Series Magnetic front sight improves visibility in all lighting conditions and features easy installation with the magnetic base. The S-Series includes one LitePipe, available in either red or green.S200: fit ribs from .171\" - .265\" (11/64 - 17/64\"; 4.2 mm - 6.7 mm). Fits Beretta: 686 and 687 models with ultra narrow rib, AL390, A304, AL390 Field, 391 Urika Field; Browning: Gold Series, 28 ga. and .410 Citori; Sigarms: SA-3 Hunter, SA-5 Upland; Benelli: 20 ga.S300: fits ribs from .218\" -.328\" (7/32 - 21/64\"; 5.5 mm - 8.3 mm). Fits Remington: All field models; Browning: Gold 10 ga., BPS, Auto-5; Beretta: Comp., T and ST ribs, Pintail auto; Ruger: Red Label field guns; Ithaca: Model 37 and other models: Benelli: Super Black Eagle and all field guns; Franchi: Field guns.S400: fits ribs from .328\" - .437\" (21/64 - 7/16\