Here’s the ultimate and impractical AR accessory you never knew you wanted.
If you ever wanted to shoot hundreds of rounds of 12ga out of your AR without reloading than this is the upper for you. According to its creator this upper attaches to a standard AR-15 lower receiver quickly turning it into a shotgun. If you happen to have a registered M 16 lower or a drop in auto sear it can quickly become 12 gauge belt-fed machine gun of your dreams.
As you can see in the video there are some feeding issues, but that’s because it—at the time of filming in 2009—was still a prototype.