Reload your firearm with the Smith & Wesson M&P .40 S&W/.357 Sig 10-Round Replacement Magazine. Compatible with Smith & Wesson model M&P .40 S&W and .357 Sig caliber firearms, this magazine offers a 10-round capacity and a detachable design for easy attachment and removal. Smith & Wesson M&P .40 S&W/.357 Sig 10-Round Replacement Magazine - Shooting Supplies And Accessories at Academy Sports