Update: Yesterday in SFO, a part of the world that really doesn't look too highly upon firearms, I found I could buy Guns and Ammo magazine in the store closest to the entrance of the SFO UC. So SFO deems it safe post security to read a magazine about firearms but United Airlines and a good chunk of the FlyerTalk readers are freaked out about it.
I wonder if they will ban employees of the firearm industry from coming in next!