The Tristar Viper Max is a very versatile semi automatic field shotgun that allows you to shoot anything from light target loads to heavy magnum waterfowl loads, using a two piston system. For target and upland game, use the light piston and 2.75" shells. When waterfowl are the order of the day, simply swap pistons and load up with magnum 3.5" loads. The secondary piston stores in the forearm. The shotgun uses Beretta/Benelli pattern choke tubes, and is supplied with improved cylinder, modified and full chokes.