What the... what kind of a genius considers an AR-15 an automatic weapon?
It will occasionally double-tap after extended use, from the heat, from wearing down the sear, too much lubricant, and from chucking a good several hundred or even a couple thousand rounds through it. The M-16 series was designed from the start as fully automatic, and that flaw carries over slightly to the AR-15. Anyone who knows anything about it knows the AR-15 isn't a full-auto gun. One look at the sear from any half-decent forensics lab and you can tell that it just needs a part replaced, if the weapon is not intentionaly turned full auto than its not a machinegun. Hell our AR-15 does that on occasion, and I'm damn sure the M4 I'm getting this summer will do that too after extended use. Last time I checked and forgive me if my info is out of date me just being AROTC and all, but a machinegun was a fully-automatic belt-fed rifle usually mounted on a bipod or tripod man-portable or crew-served and vehicle mounted designed to engage and suppress infantry at ranges from point-blank to nearly 800+ meters depending on the gun in question and point/area targets.
I'm trying to figure out who rigged the jury? 'cause only a bunch of stoned teenagers or ultra-liberal moon-bats could convict a man off the evidence from that video.