Shop › MAG S&W M&P 40SW/357SIG 15RD MAG S&W M&P 40SW/357SIG 15RD $42.00 Smith & Wesson Magazine, 357 Sig/ 40 S&W, 15 Rounds, Fits M&P , Steel, Black 194390000 Quantity: Add To Cart Added! Smith & Wesson Magazine, 357 Sig/ 40 S&W, 15 Rounds, Fits M&P , Steel, Black 194390000