Had one in a previous lease in SA, had them in AZ, FL, and a few other southern states, all private, non housing authority properties.
Always ignored them. No need to talk to them at all as I never felt it was their business to know that I owned firearms. IF I actually had to use a firearm in defense of my family or property, the possibility of eviction wouldn't cross my mind. More then likely I would be looking to find new residence anyway.
Crazy. I check whenever I get a new lease, never have seen a no-guns thing, though. Would definitely negotiate that part out for sure, if I bothered renting there at all.