The TriStar Viper Series Semi Automatic Gas Operated Shotguns are reliable, functional and hard working. Both wood and synthetic models have 3" chambers to take 2 3/4" or 3" shells. Chambers are chrome lined. Barrels are threaded for the Beretta®/Benelli® style choke tubes and every gun comes with 3 tubes (IC, M, F) standard. Manual E-Z Load Magazine Cut-Off. Vent Rib with Matted Sight Plane. Fiber Optic Front Sight. 3 Beretta®/Benelli® Style Chokes (IC, M, F). 5 Round Magazine - Shot Plug Included. Chrome-line Chamber and Barrel. Soft Touch on all Synthetic Models.