“Is this really just a glorified potato cannon? Why yes it is. But will it launch that potato through a brick wall, a car door or even your neighbor? Why yes it will.”
The vacuum accelerator is a scrap cannon, typically employed by low-budget militia types, which is used to launch almost any item, at an extreme velocity.
The design is very simple: A tube from which all atmosphere is removed, after the desired projectile is placed inside of it. When one end of the tube opens, the atmosphere rushes in, creating enough internal pressure to accelerate most objects beyond the speed of sound. The user should be careful to select the appropriate projectiles however, as misfires are commonplace when trying to launch jagged objects, which may collide with the edges of the nuzzle in ways that sends them flying in unfortunate directions.