This shotgun slug has a live 9mm round inside of it. When the round impacts the target, it should set off the 9mm round and hit the target twice. The concern is that the inertia of the initial shot will set off the round inside the barrel.
This round is so dangerous that the guys at Toufladermous test it in stages. They end up shooting the round with wax slugs to see if it will set off the 9mm shell.
Watch here and tell us what you think.