"The TriStar Arms Viper G2 Pro Sporting Semi-Auto Shotgun comes loaded with features for the demanding sporting clay shooter or hunter. Oversized controls make it easy to operate in any weather, with or without gloves. The Viper G2 features TriStar's proven gas operating system that can handle everything from light target loads to heavy waterfowl loads without missing a beat. The raised target rib, matte sight plane, and fiber-optic front sight make targeting fast and intuitive. Chrome-lined chamber and bore. Accepts Beretta/Benelli Mobil chokes, and includes 4 tubes (SK, IC, M, F). Includes shim kit. Mfrs. 5-year warranty. Oversized controls for easy operation Gas operating system with 3"" chamber Raised target rib and matte sight plane Fiber-optic front sight Chrome-lined chamber and bore Accepts Beretta/Benelli Mobil chokes Includes 4 choke tubes (SK, IC, M, F) and shim kit"