The TriStar Viper G2 is a series of gas operated semi-automatic shotguns. They are available with wood or synthetic stocks and each Viper G2 features a chrome lined 3 chamber threaded barrel and Beretta-style IC M and F choke tubes. Additional features may include a vent rib with matted sight plane fiber optic sight quick shot plug removal barrel swivel studs tubular magazine soft touch stock and forend coating (synthetic models only) and adjustable comb (Sporting model only). Details Semi-auto. RealTree Advantage Timber synthetic stock forearm and finish. Chrome-line chamber and barrel. Manual E-Z load magazine cut-off 5rd magazine (shot plug included). Fiber optic front sight. (3) Beretta style chokes (IC M F). 12ga 3 26.