The 590S is Mossberg's short-shell capable pump-action designed to cycle 1.75-inch mini shells in addition to standard 2.75-inch and 3-inch shells. The OptiMag system uses an adjustable stop to feed short shells reliably. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 9 Year introduced: 2020, USA Weight: 7.25 oz Overall length: 38.5" Status: Active Intended use: Home Defense / Tactical