Black Aces Mossberg 500-590 Tactical Rails are the best tactical quad rails to be developed specifically for the Mossberg 500, 590, or 590A1. As the best rail, you can mount pretty much anything you would want to it. Fit anything that you would normally mount to a rifle onto your shotgun. This rail is not only lightweight, but its extremely rugged and durable. The one piece T6 6061 aluminum construction weighs just 14 ounces. A full installation kit with tools helps you install this quickly without damaging your weapon. In several states it may be illegal to conceal the serial number, so we have designed these rails to keep the serial number visible. Competitor's weapon rails cost more and weight more, so look no further!