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.