Matthew Herper at Forbes has a great list of links to a number of excellent studies on the relationship between guns and rates of gun deaths, writing:
It is in this context that the NRA's statements against gun control and gun violence make sense. Once a truly grass roots organization aimed at promoting gun safety, the formidable lobby group has long since been taken over by the gun industry. Well over half of its 200+ million dollar annual revenue comes from corporate sponsors and advertising rather than program fees or membership dues. Of its corporate sponsors, 74 percent are in the firearms industry, including "Arsenal, Inc.; Benelli; Beretta USA Corporation; Browning; Charles Daly (now out of business); DPMS Panther Arms; Doug Turnbull Restoration, Inc.; FNH USA; Glock, Inc.; H&R 1871, LLC; Investment Arms; Krieghoff International Inc.; Marlin Firearms; McMillan Group International; Nosler; ParaUSA; Remington Arms Co., Inc.; John Rigby & Co.; SIGARMS, Inc.; Smith & Wesson Corporation; Springfield Armory; and, Sturm, Ruger & Co., Inc."
The NRA mantra, "More guns = more safety," makes about as much sense as "peace through war" or "Arbeit Macht Frei." But more guns = more $$ for gun manufacturers, which are, sorry to say, the bread and butter of the NRA. In its "corporate partners" brochure,NRA Executive Vice