The Tristar Vipermax semi-automatic 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 Beretta/Benelli 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.