http://www.nbc29.com/story/20719160/man-walks-in-to-hydraulic-road-kroger-with-assault-rifle
So, looks like he was just trying to make a point about his second amendment rights. Although he could have chosen a better way to get his point across.
Guaranteed that 99% of open carry activists will know the law better than you do. I'd never OC because of all the liberal dumbfucks in this area who can't tell the difference between an assault rifle and their own rear end.