They look things one step further and 3D-printed a shotgun slug that completely works, firing from a shotgun and all. The slugs were shot from a Mossberg 590 12-gauge shotgun.

For example, a shotgun sighted in last year in a left-to-right 15 mph wind at 100 yards will have that slug moved 9-11 inches to the right.

The shotgun is more than adequate for the vast majority of armed confrontations. Buckshot dispersion is a potential problem, but this problem may be alleviated by using slugs.