What about by use?  Clearly cars are used at a much higher rate than guns.  I'd assume more people have cars than guns, but I'm not sure.  2/3 of gun deaths are suicide.  Guns make you more likely to kill yourself when the going gets tough. Not sure how many suicides there are by tailpipe. 

Considering how much money we spend on the DOD you'd think we'd try to actually protect our citizens, even from themselves.