The TriStar Viper Series Semi Automatic Gas Operated Shotguns are reliable, functional and hard working. These are 3" gas operated, semi-automatic shotguns that allow you to shoot light target loads to heavy waterfowl loads interchangeably. Removable choke system uses Beretta/Benell Mobil Threads, includes three choke tubes (IC, M, F), choke box, and wrench. Cerakote receiver, high-grade Turkish walnut with cut checkering and semi-gloss finish. Rubber Recoil pad, Fiber optic sight and shim kits standard.