Smith & Wesson Response, Semi-automatic Rifle, AR, 9MM, 16.5 Barrel, Black Oxide Finish, Black, B5 Systems California Compliant Grip, Fixed Stock, Free Float M-LOK Handguard, Optics Ready, 10 Rounds, 1 Magazine, Includes 2 FLEXMAG Adaptors, California Compliant 13978 Smith & Wesson Response Carbine 10-round California Compliant Model. Breaking barriers for those looking to enter the pistol caliber carbine market. With it's innovative Flexmag System, you can use a wide range of double stack 9mm pistol magazines from Smith & Wesson and other manufacturers.