Smith & Wesson M&P 15-22 Sport, Semi-automatic Rifle, AR, 22LR, 16.5 Threaded Barrel, Black, 6 Position Collapsible Stock, 10 M&P Slim Handguard with Magpul M-LOK, Magpul Flip-Up Front and Rear Sights, 25Rd 10208 The M&P15-22 SPORT features a 10-inch M&P slim handguard that incorporates the popular Magpul M-LOK system. The M-LOK system allows rifle owners to easily customize their M&P15-22 SPORT by adding accessories without removing the handguard.