Well, I can't find a better thread so what do you think about the aerodynamics this?
bigcommerce.com: Fishing Spear Accessory for the Can Cannon
This is a dart for fishing. Arrowhead not included. In theory the plate acts like the fletching on an arrow. I have no idea how the tip is centered in the bore. Using it to fish from a boat would involve refraction of the sight line, but then don't AR-15s work under water.