Smith & Wesson M&P15T rifle is based on the popular semi-automatic AR-15 rifle. This rugged, lightweight rifle is chambered in 5.56mm NATO and is built to perform flawlessly under varied conditions. As tough as it is effective, it comes with a 16 5-groove barrel, chrome bolt carrier and gas key while its six-position adjustable CAR stock easily accommodates varied shooters and shooting positions. This M&P15T model features a 13 M&P slim, modular, free-float rail system with Magpul's M-Lok capability and includes a 2 M-Lok Picatinny-style rail panel for mounting your accessories.