Mossberg's entry into the AR-15 market. The MMR Tactical (Mossberg Modern Rifle) uses a direct impingement system with a flat-top upper, free-float handguard, and a 16.25-inch barrel. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm Capacity: 30 Year introduced: 2011, USA Weight: 7.1 oz Overall length: 36.5" Status: Active Intended use: Home Defense / Sporting