The Mossberg 590A1 Retrograde in the 9-shot 20-inch configuration with walnut furniture. All military-spec construction under the traditional exterior. Ghost ring sights. One of the most visually distinctive defensive shotguns currently in production. Type: Pump Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 9 Year introduced: 2018, USA Weight: 7.75 oz Overall length: 41" Status: Active Military use: Yes Intended use: Tactical, Military, Home Defense, Collector