Mossberg barrel - Mossberg 500 12 Gauge Security Barrel 18.5in Matte

I ordered this barrel for a replacement for my mod 500 with a 20-inch heavy barrel. The picture on the web site showed a barrel with the attachment that goes over the magazine tube. This is the type of barrel I now have. The barrel I received has the screw type attachment that screws into the magazine tube. I cannot use this barrel. The picture should be changed. Disappointed.