The only issue with open carry is that once you sit down it isn't open. In some states if you turn to where LEO is now 180 degrees from the holster it isn't open. The biggest issue is you are seen in the Walmart by some old woman that hates guns with a gun. She calls the law. While you might be legal (not in a Walmart though that will post no weapons at the door) she has called the cops and to them you are just the guy with a gun. This tends to make them nervous. One would have to expect to be stopped from time to time to be asked about the permit you need because your gun is not in compliance with OC laws.
I'm sure I've not quite said all that right..There are much better qualified people to explain it around here that can clear up whatever I muddied..heh