The Classic Mono Gun is available in six models: The Standard Rib, the Medium Rib, the Medium Rib with Screw in Chokes, the Olympic Rib, with or without Screw in Chokes and the New Deluxe PRO3. The Medium Rib height is half the height of the Olympic Rib. All models come with American Walnut wood and are offered with custom detailing, with the exception of roll over combs, cheek piece stocks and extreme cast on and off which carry added labor charges. Should you prefer English Walnut or wish to up grade the quality of wood and or checkering, or install a release trigger, please refer to the enclosed accessory price sheet. The accessory sheet also shows many added available options. BBL. Length 32"-34"-35". Add $300 for Screw In Choke BBL for all mono guns.