M&P 15 Sport II with an 18-inch barrel for improved long-range performance. The extended barrel produces approximately 75-100 fps of additional velocity over the standard 16-inch Sport II and improves accuracy at distances beyond 300 yards. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2017, USA Weight: 25.8 oz Overall length: 37" Status: Active Intended use: Home Defense, Recreational Shooting