Each model easily snaps over rib without need for screws. Full windage adjustment (Adjustable Model only). Front diameter is .060"; rear diameter is .035". 1/4" fits most Remington; Browning Gold (camo) and Charles Daly. 3/8" fits most Mossberg; Weatherby; Winchester and popular 10 gauge models. 6mm fits most Beretta Field Grade; Benelli 20 gauge. Browning gold / A-5 and Franchi. 5/16" fits most Benelli, Browning BPS; Ithaca; Ruger Red Label; Savage and 8mm ribs.
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