The Viper G2 Pro is a gas operated, semi-automatic shotgun that allows you to shoot light target loads to heavy waterfowl loads utilizing a two piston system. The secondary piston can be stored in forearm for easy retrieval. Featuring manual E-Z load mag cut off; vent rib w/matted sight plane; quick shot plug removable; swivel studs and fiber optic sight. Includes shim kit, shot plug, three Beretta/Benelli Mobil Chokes- improved cylinder, modified and full.