The S&W M&P15 is one of the most widely issued AR-pattern patrol rifles in US law enforcement. Features a 16-inch barrel, direct impingement gas system, and M4-feed ramps. Its competitive pricing drove adoption by smaller departments transitioning from shotguns. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2006, USA Weight: 6.7 oz Overall length: 32" Status: Active Intended use: Law Enforcement, Patrol Rifle