TriStar Viper Max Full Size 12 Gauge Semi-Auto 3.50" 5+1 28" Overall Realtree Max-7 Vent Rib Barrel, Steel Receiver & Realtree Max-7 Synthetic Stock, Beretta/Benelli Mobil Chokes, Right Hand The Viper Max 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 mag cut off action; vent rib w/matted sight plane; quick shot plug removable; swivel studs and fiber optic sight. Includes shot plug, four Beretta/Benelli Mobil Chokes- skeet, improved cylinder, modified and full.