The Mossberg 500 Security is the dedicated home defense configuration with an 18.5-inch cylinder-bore barrel, synthetic stock, and bead sight. The gold standard of affordable defensive shotguns. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 6 Year introduced: 1975, USA Weight: 6.75 oz Overall length: 37.5" Status: Active Intended use: Home Defense