Smith & Wesson M&P 15-22 Pistol, Semi-automatic, AR Pistol, 22LR, 8 Barrel, Matte Black Finish, Pistol Stabilizing Brace, M-LOK Handguard, 25 Rounds, 1 Magazine, Magpul MOE SL Grip 13321 The M&P15-22 features a M&P Handguard that incorporates the popular Magpul M-LOK system. The M-LOK system allows rifle owners to easily customize their M&P15-22 by adding accessories without removing the handguard. M&P15-22 owners have the option of easily mounting numerous M-LOK-compatible accessories or any number of Picatinny-style rail sections designed to accommodate other accessories.