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A video of a new shotgun design has gone viral on the Internet. This isn't some ordinary duck-hunting shotgun though: this is a belt-fed shotgun, attached to the lower receiver of an AR-15 rifle. Intrigued? Of course you are.

The video shows a stubby-barreled gun firing firing continuously from a belt of 12 gauge ammunition. The upper receiver of the gun appears home-made, while the lower appears to be a standard AR-15 rifle lower receiver. The shotgun has a very short barrel—too short (more on this later)—and fires both full auto and semi-automatic.

How does it work? We can only guess. Despite having an AR-15 lower receiver it doesn't appear to share other aspects of the AR-15 platform, particularly the gas recycling system that uses hot gasses automatically reload the weapon. It appears to use the buffer tube and stock of an AR-15, but that may be just to give it something for the user to brace his or her shoulder against.

The YouTube account holder who shared the video hasn't uploaded any others—or any other details regarding his invention—since it was posted in 2009. It's possible he was paid a visit by the Bureau of Alcohol, Tobacco and Firearms—by law shotguns must have a minimum barrel length of eighteen inches to remain legal; which may explain his silence online in the 7 years since.

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