Not exactly legal in skeet shooting

Wired has a review of the AA12 automatic shotgun:

Meet the AA-12 (Auto Assault 12) automatic shotgun, a weapon that would be more at home in a first-person-shooter than in the real world. The 12 gauge gun will spit out 300 rounds per minute, and has a range of projectiles, including the Frag-12, which is more of a miniature missile than a bullet: it has a range of up to 175 meters (575 feet).

The AA-12 is designed for military use, and can survive below zero temperatures or a dunk in salt water thanks to its stainless steel construction. It uses a Tommy-Gun like cylinder to feed in the cartrides and is designed to operate with almost no recoil.

The AA12 can also use a sophisticated grenade projectile with a blast radius of nearly ten feet.

Daddy like.

More info:
Defense Review: the Auto Assault 12 (AA12) Combat Shotgun
YouTube: Operation of the AA12.