Hi, Smalls,
Sometimes, a principle is important enough that people are willing to violate the law, even go to prison, for what they believe in. (The civil rights "sit ins" come to mind.)
But I don't see anything in the original post or the responses to indicate that that is the situation here. The OP wrote about proving a point, not fighting for some noble principle, and you replied on the basis that he can do anything as long as it is not specifically illegal. But if you look at the laws of any state or town, you will find "catchall" laws designed and intended to arrest folks who think like that.
It is not necessary that a law be specific to be enforced. No one is going to write a law that says it is illegal to strip naked and bathe in the city fountain at high noon on July 4th, allowing such bathing at other times. The law will be about indecent exposure, or causing a disturbance, or maybe causing people to roll around laughing. So even if there is no law specifically saying you can't open carry a rifle or shotgun, that doesn't mean you can get away with doing so and flipping the bird at the cops. And no, a case like that won't get to SCOTUS. It won't get any further than a county court, if that far. But if some hotshot DA, owned and operated by Mayor Bloomberg, gets involved and goes for charges like threatening, endangering, brandishing, and so on, it could get into felony territory.
But of course, you would not be the one facing charges. You are just pretending to be Perry Mason, telling the OP that he has no worries and egging him on.
Jim