Smith & Wesson M&P15-22 Sport MOE, Semi-automatic, AR, 22LR, 16.5 Threaded Barrel, Flat Dark Earth MOE-SL Grip, Stock and Rail Panels, 25Rd, Flip Up Front and Rear Sights 10210 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.