YouTube personality and slingshot designer Joerg Sprave didn’t build this PVC sewage pipe slingshot “rifle” because it offered better accuracy or ballistics. He made it to prove a point.
A traditional rifle includes a barrel with a pattern of grooves cut into the interior. This little feat of engineering imparts a spin to the projectile exiting a firearm’s barrel, providing better stability and generally making the shot more accurate. Sprave’s version is a drill-powered, rotating PVC pipe that flings a spinning steel ball. It works, although any benefits that a spinning ball shot has is dubious at best.