Mossberg 500 with ghost-ring aperture sights in 12 gauge with 18.5-inch barrel. Faster target acquisition than bead sight for defensive use. Type: Shotgun Action: Pump Caliber: 12 Gauge Capacity: 6 Year introduced: 1995, USA Weight: 7 oz Overall length: 37.5" Status: Active Intended use: Home Defense/Law Enforcement