The Tristar Vipermax semiautomatic shotgun that allows you to shoot light target loads to heavy waterfowl loads utilizing a two piston system. The Viper Max comes with a light and heavy load piston. Use light load piston for 2 shells for other rounds use heavy load piston. Secondary piston can be stored in forearm for easy retrieval. The Viper Max comes with 4 BerettaBenelli Mobil Chokes SK IC M F as well as over molded rubber grips on the stock and forearm for added comfort. Newly developed recoil pad. Includes swivel studs and 5rd magazine."