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Joe, the 620 is the 20 gauge version. Available here : https://www.budsgunshop.com/product_info.php/products_id/24863/cz-usa+cz+620+pump+20+ga+28+3+turkish+walnut+stock+steel+rcvr ----- 3" Chamber & Includes Set of 3 Chokes (Full, Modified & Cylinder). Cheers and stay safe!