I came across this youtube video that said Banned Gun ad for the Superbowl 2014. I had to do some more research into it, but it in fact was turned away by the NFL.
Because it didn't go with the rules that the NFL had set up for it's category.
The NFL has responded saying that they have never even reviewed the ad, and the whole thing was a hoax from Daniel Defense.
See for yourself. Not really sure what rules are being broken?