The M&P15 PS (Patrol Series) is a law-enforcement patrol rifle featuring a 16-inch barrel, carbine-length gas system, and minimalist furniture configuration designed for duty use. Features a Picatinny top rail, standard M4 handguard, and six-position collapsible stock. The PS designation indicates LE procurement targeting — sold through law-enforcement distribution channels at patrol rifle program pricing. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2013, USA Weight: 6.4 oz Overall length: 35" Status: Discontinued Intended use: Law Enforcement, Tactical