The tristar viper series is a semi-automatic gas operated shotgun that is reliable functional and hard working.Its removable choke system uses beretta/benelli mobil threads includes three choke tubes ic m f choke box and wrench.The viper features manual e-z load mag cut-off vent ribbed barrel with matted sight plane and fiber optic front sight and chrome-plated chamber.A shot plug is included.Action: Semi-AutoGauge: 16 GaugeBarrel Length: 28"Capacity: 5+1Chamber: 2.75"Weight: 6.50 lbsChoke Configuration: MobilChokeChokes Included: F M ICBarrel Description: Vent Rib Chrome-LinedSights: Fiber Optic FrontSafety: CrossboltBarrel Length Range: 28" to 28.99"Weight Range: 6 lbs to 6.99 lbsHand: RightStock Finish Group: Brown