The TriStar Viper series is a semi-automatic, gas operated shotgun that is reliable, functional and hard working. Its removable choke system uses Beretta/Benelli Mobil threads, includes three choke tubes IC, M, F, choke box and wrench. The Viper features manual E-Z load mag cut-off, vent ribbed barrel with matted sight plane and fiber optic front sight and chrome-plated chamber. A shot plug is included.