The M&P15 Sport II is the entry-level AR-15 in the Smith & Wesson lineup, featuring a 16-inch barrel, M4 feed ramps, dust cover, forward assist, and a 6-position collapsible stock. One of the best-selling AR-15 rifles in the US market by volume. Type: Rifle Action: Semi-Automatic Caliber: 5.56mm NATO Capacity: 30 Year introduced: 2015, USA Weight: 6.45 oz Overall length: 35" Status: Active Intended use: Home Defense, Range, Training