Posting signs & brandishing firearms in public is not advised. It makes it harder for your lawyer to use the poor scared citizen defence. You look like you invited trouble.
They'll know I'm armed when they hear the safety, click, BOOM!
Don't draw your weapon unless you plan to pull the trigger! And if you do draw it, be sure you do pull! Don't play!
I've carried a gun for 25 years & no one has ever seen my gun. That's how it's done. This way, I WILL have it, when I do finally need it.
Peace
doublejj