The Smith & Wesson Response breaks barriers for those looking to enter the pistol caliber carbine market. With its innovative Flexmag System you can use a wide range of double stack 9mm pistol magazines from Smith & Wesson amd other manufacturers. The familiar MSR controls make it an easy transition for those looking to use on the range and with the ability to change parts with existing MSR accessories it makes optimizing to your needs easy. Take control with the new Smith & Wesson Response! - Model Smith & Wesson