Vortex Viper PST 3-15X44 SFP MOA Ebr4Vortex Viper PST 3 15X44 SFP MOA EBR 4 The Vortex Viper PST 3 15X44 SFP MOA EBR 4 is an updated favorite that hands an unfair advantage to shooters who seek to keep the upper hand in every situation, from close quarters to long range shots. This scope is designed to deliver reliable field performance when it matters most, pairing sophisticated technology with rugged engineering that can withstand the harsh realities of tactical operations, hunting