The Mossberg 500 Flex system uses a proprietary tool-less locking mechanism that allows the stock and forend to be swapped in seconds without tools, enabling rapid configuration changes between field and tactical setups. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 6 Year introduced: 1961, USA Weight: 7.75 oz Overall length: 38.5" Status: Active Intended use: Tactical/Home Defense