The Mossberg 590S accepts all 12-gauge shell lengths from 1.75-inch mini shells to 3-inch magnums without any adapter. 18.5-inch barrel, heavy-duty construction of the 590 line. Military-spec metal trigger guard and safety. Ghost ring sights. Type: Pump Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 9 Year introduced: 2020, USA Weight: 7.25 oz Overall length: 38.5" Status: Active Military use: Yes Intended use: Tactical, Home Defense, Military