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! – 16.5 1:10 twist barrel – FLEXMAG magazine well adapters. (Interchangeable magazine well adapters that let you use a variety of magazines from Smith & Wesson and other manufacturers.) – 32 1/8 collapsed length 35 3/8 extended length. – 1/2-28 threaded muzzle with thread protector. – Flat-face trigger with crisp break. – M-LOK® slots on handguard with Picatinny-style rail on top. – (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. – 2 x 23-round magazines. – CALIBER 9MM – SIZE RIFLE – CAPACITY 23 – ACTION BLOW BACK – BARREL LENGTH 16.5 – Width 2.75 in – Length 32.13 in – Height 8 in – Weight 94.4 oz – GRIP POLYMER – SIGHTS NONE – OPTIC READY YES – SAFETY THUMB SAFETY – COLOR/FINISH BLACK – THREADED BARREL YES – BARREL MATERIAL 4140 CM – FRAME POLYMER – NUMBER OF MAGAZINES 2 – STOCK ADJUSTABLE