OK, I read the ad copy.
From what I read, it is a Sabbotted slug in a shotgun shell, which will send a relatively inaccurate (in rifle terms) bullet down a rifled shotgun barrel with sufficient force to penetrate a ballistic vest.
So explain to me again why this won't be banned along with centerfire rifle ammunition? For that matter, explain to me why they won't define a shotgun with a rifled barrel as "a rifle" if the fancy strikes them.
1) Turn in your guns like a good sheeple (NRA==>> enforce existing gun "laws")
2) Keep em, hide em, and become a so called "outlaw" - go to the gulag if caught
3) Become an "outlaw" patriot and fight to keep em
Guess which one's legal?