Smith & Wesson Response 9mm Luger 16.5in Black Oxide Semi Automatic Modern Sporting Rifle - 23+1 Rounds - 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 and 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! FLEXMAG magazine well adapters: Interchangeable magazine well adapters that let you use a variety of magazines from Smith & Wesson and other manufacturers. (2) FLEXMAG magazine well adapters (1-M&P Double stack - installed, 1-G17/G19). Compatible with M&P Pistol double stack magazines and G17/G19 magazines. Compatible with many MSR stocks, triggers, grips, and charging handles. Customize the Smith & Wesson Response to your needs. Leveraging standard MSR controls so the Smith & Wesson Response operation is familiar to the user 32-1/8in collapsed length, 35-3/8in extended length. 1/2in-28 threaded muzzle with thread protector. Flat-face trigger with crisp break. M-LOK slots on handguard with Picatinny-style rail on top. 2 x 23-round magazines.