16? 1:8 Twist, 5R Rifling. Flat face trigger. M&P grip with interchangeable palmswells. Magpul CTR carbine-length stock. 15-inch free-float M-Lok handguard. Magpul MBUS dual aperture, flip-up, adjustable sights. Ambidextrous Radian Raptor-LT charging handle. Ambidextrous safety selector. M4E flash suppressor. M&P M-Lok rail included. Forged, integral trigger guard. Mfg: Smith & Wesson