The Mossberg 500 SP Security is a basic home defense variant featuring an 18.5-inch barrel, heat shield, and a bayonet lug for attaching a standard bayonet, combining traditional military aesthetics with a budget defensive price point. Type: Shotgun Action: Pump-Action Caliber: 12 Gauge Capacity: 5 Year introduced: 1975, USA Weight: 7.25 oz Overall length: 38.5" Status: Active Intended use: Home Defense