The Mossberg 590A1 Ghost Ring variant adds factory-installed ghost-ring rear and ramp front sights to the full 590A1 military specification, providing improved aiming precision for slug shooting and tactical applications without requiring aftermarket sights. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 9 Year introduced: 1987, USA Weight: 8.25 oz Overall length: 41" Status: Active Military use: Yes Intended use: Military/Tactical