SpudFiles

So I was looking at potato cannons (I know suprising right!?) And I notices they aren't terribly accurate so I figured hey make it more accurate and shoot fully auto magic by making a trigger pulls that injects air and all into the chamber ignites that with a 0.12 second delay from when it was I injected then the igniter ignites it it would be 50 cal and "rifled" inducing spin on darts, similar to how a thrown football is stabilized by a spiral. This is achieved by using strings (like fishing line) or internal bearings within the barrel to frictionally impart a twist to the dart as it flies out. This rotation stabilizes the dart's flight, reducing "fishtailing" and making shots straighter and more accurate. 

Interesting idea, but that sounds like it could get complicated fast. Accuracy gains might be limited, and safety would be a big concern with anything automatic or ignition-based.