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 BerettaA(R)/BenelliA(R) style choke tubes, and every gun comes with 3 tubes (IC, M, F) standard. FEATURES: Manual E-Z Load Magazine Cut-off Vent Rib with Matted Sight Plane Fiber Optic Front Sight 3 BerettaA(R)/BenelliA(R) Style Chokes (IC, M, F) 5 round Magazine - Shot Plug Included Chrome-line Chamber and Barrel Soft Touch on all Synthetic Models