VIPER/SMAWT intermediate design mockup 1978 used for sight alignment and sighting tests (distinctive shoulder stop allows to identify this piece of weaponry unmistakenly as SMAWT rather than the VIPER)
Own work using: Location of Sights and Trigger Mechanism and Time to Fire for a New Infantry Shoulder-Fired Antitank Weapon (Viper), Page 4
Dominick J. Giordano, Human Engineering Laboratory, Aberdeen Proving Ground, Maryland