The vomit gun was an attempt to create a non-lethal weapon that would incapacitate enemies rather than injure or kill them. Built using a series of LEDs that pulse at different frequencies it could cause anyone who looked at it to feel ill and become almost instantly nauseous. The United States military eventually abandoned the project but amateurs have created their own versions using everyday materials.
The .905 is essentially just an extremely powerful sniper rifle. It can fire rounds at a top speed of 2,100 feet per second and almost completely destroy targets that are within its huge range. They are also incredibly expensive as they need specialist equipment and accessories that won’t break under the intense energy produced when it fires and a single bullet can cost around $40.