Belt-fed shotgun upper receiver for AR...how legal is this?

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Legally, upper receivers are not firearms, just parts, nor are they parts that perform a restricted function (such as allowing fully automatic fire). Currently there is no Federal legal precedence for barring the ownership or use of such parts. As long as the barrel is of legal length, it is legal barring local restrictions.

However, the device is impractical. It jams because plastic husks deform in an unpredictable manner when fired. You would need to use metal husks to get reliable results, and this typically means loading your own or getting them from Russia.
 
As long as it only fired one round per pull of the trigger, it would be the same as any other upper, but it appears to fire from the open-bolt position, and BATFE takes a very dim view of such things as they're easier to convert to FA.
 
Depending on the design of the upper, the ATF may consider them to be a firearm. For example, the BRP XMG beltfed upper is considered a firearm in and of itself.
 
I think it just cost him 300 dollars in ammo to make that video...

that would be the epic zombie-mower gun in a movie.
 
It appeared there were numerous jams. The gun design appears to need more development. Recoil must be hard to control. Cost was not likely $300 if he was using the cheaper dove loads or even reloads.
If he had the proper paper work, the gun is legal.
 
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