RE:NO FIREARMS BEYOND THIS POINTUnless it’s a federal building or a building that carries a notice where federal decree gives actual notation on that sign such as a building where more than 51% of its revenue is made up from alcohol consumption , no guns allowed signs in a vast majority of states do NOT carry weight over state law or second amendment constitutional rights of people.
Which I personallythink is lunacy - however it is a matter of fact and law that many USA presidents have failed to even get a reading for simple variations.
In the regard of Las Vegas as an example check out.
www.nevadacarry.org
What you state in regard to the possibility of it being used in other locations is a very distinct possibility and after testing and federal approval.