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Hi john and welcome. No, 3913TSW mags will fit the CS9(just different base plates):. budsgunshop.com/product_info.php/products_id/711010893/magazine+for+smith+%26+wesson+908+3913+3914+3953+series+9mm+8+r ----------------------------------------------------------------------------------- ebay.com/shop/3913-magazine?_nkw=3913+magazine

No, it will not. But below is the magazine you need, currently out of stock here at Buds. https://www.budsgunshop.com/product_info.php/products_id/26091/smith+%26+wesson+3913tsw+9mm+6+rnd+magazine

no you need https://www.budsgunshop.com/product_info.php/products_id/26091/smith+%26+wesson+3913tsw+9mm+6+rnd+magazine