I have a Viper up for sale or trade for a Vortex Diamondback Tactical FFP EBR-C2. It’s in very good condition and has been mounted on a bench gun. Glass and 6 screw rings (I don’t know the brand, but they look like Weaver Tactical) are yours for $540. Glass on Amazon $639 and rings are $30. Located in Benbrook. Thanks for looking.