The Violence Policy Center is famous for that. "Why, from this location right here a terrorist could hit all of these valuable targets in douwntown Washington DC with a 50 caliber rifle." They are also widely and loudly advertising that there aren't background checks at (some) gun shows, thereby telling terrorists where to buy guns, if in fact they desire them.
""They are also widely and loudly advertising that there aren't background checks at (some) gun shows, thereby telling terrorists where to buy guns, if in fact they desire them.""
Of course they are. They're just "bunching them" right now. They're going to have surveillance at the computer shows. No doubt someone with the appropriate background will be caught there trying to buy a gun, and suddenly it'll be alright to have the federal government monitoring all gun transactions actively at the point of sale. I would argue that gun sales need to regulated with background checks. Personally, I think they should be done at gunshows, too. But I don't think what is happening now is the way to lobby for that.