This is the Lund Variable Velocity Weapons System, a combustion-powered rifle that can both kill or stun an enemy. It was developed by the creators of Honey My Baby Pony and Tickle Me Elmo dolls for the Pentagon. No kidding.
Lund—a company specialized in creating toys—started to work with the Pentagon under the Small Business Innovation Research funds, following the military's objective to develop a non-lethal weapons arsenal.
To achieve its double-function, the LVVWS works at two different speeds. By clicking a switch, the weapon goes from one mode to the other. To make is safer, it also has an automatic range-finder detector that will automatically vary the speed depending on the distance to the target. [Danger Room]