Locally this issue came about a year or so ago. We had some pushing for signs and banning (occurred right around the time we had our first robbery, gun involved) and others insisting it would cause more backlash than anything.
It's been a year, nothing is posted and we've never had an issue. I don't think anyone's even spotted a weapon unless it was attached to a LEO. But, we're a bunch of peaceful farmers and people only get violent over land (or meth) disputes.
Just a second, let me sprinkle around some fairy dust and make all the problems go away.