3 ? gas operated semi-automatic shotgun that allows you to shoot light target loads to heavy waterfowl loads utilizing a two piston system. The Viper Max comes with a light and heavy load piston. Use light load piston for 2 ? shells for other rounds use heavy load piston. Secondary piston can be stored in forearm for easy retrieval. The Viper Max comes with 4 Beretta Mobil Chokes (SK IC M F) as well as over molded rubber grips on the stock and forearm for added comfort. Newly developed recoil pad and swivel studs also included. Back by our Five Year Warranty.Features: Magazine Cut-off Action Vent Rib w/ Matted Sight Plane Fiber Optic Sight 5 Round Magazine ? Shot Plug Included Quick Shot Plug Removal Chrome-lined Chamber and Barrel Swivel Studs 4 Beretta Mobil Chokes (SK IC M F)Specifications: Gauge: 12 Barrel Length: 28" Weight: 7.4 lbs Finish: Synthetic