Selling nukes and biological/chemical warfare agents and other things that "arms dealers" provide is not legal in the US. Gun shop owners are not commonly referred to as "arms dealers".
But thanks for shoehorning your political views into an unrelated conversation.
I'm with you, but it does seem like he's referring to "Lord of War" more than "Gun Shop Owner." The guy selling RPGs to known criminals isn't the same as the guy who sells me my AR15s