Avoid pictures of firearms and you should be ok. Stay out of the classified and don't dwell on advertising. A photo of a firearm could infect someone with the hebejeebies and you'll be liable, for their emotional distress not to mention the actual injuries of people diving for cover in the chaos that ensues.
Not so sure you are right on this one...
...with all the shootings up there, I'd suspect that locals would congregate to find out how and where they could purchase such "liberating" items.