Mossberg 500 12 Gauge Security Barrel 18.5in Matte. Mossberg crafted these Shotgun Barrels with a matte-blued finish that prevents rusting while also keeping you more concealed on hunts by not reflecting light easily. The Mossberg 500 12 Gauge 6-shot Security Barrel offers a bead sight to help guide your aim while taking down birds in the backcountry. Enhance your shooting skills by installing this Mossberg 500 12 Ga 18.5in Security Barrel. Specifications for Mossberg 500 12 Gauge Security Barrel 18.5in Matte: Manufacturer: Mossberg Finish: Matte Barrel Length: 18 in Gauge: 12 Gun Make: Mossberg Gun Model: Mossberg Model 500 Condition: New Caliber: 12 Gauge Features of Mossberg 500 12 Gauge Security Barrel: Bead sight Cylinder bore Matte blued finish Package Contents: Mossberg 500 12 Gauge Security Barrel What firearm models does the manufacturer say Mossberg 500 12 Gauge Security Barrel 18.5in Matte is compatible with? The manufacturer says that Mossberg 500 12 Gauge Security Barrel 18.5in Matte is compatible with Mossberg Model 500