TriStar’s Viper Max is a gas operated, semi-automatic shotgun that allows you to shoot light target loads to heavy waterfowl loads utilizing a two piston system. The two piston system uses a light load for 2 3/4 shells and the secondary piston can be stored in the forearm for easy retrieval. The chrome-lined barrel has a vent rib with a matted sight plane, and a fiber optic sight. The barrel also has four Beretta Optima Plus Chokes (SK, IC, M, F). The stock and forearm are constructed of a synthetic and over molded rubber grips. This 12 gauge has a 28 barrel with an overall black finish.