Gun control advocates say more guns = more crime. Specifically, the more guns there are the more murders will be committed. But is that really true? Do guns cause crime?

Rob Morse, author of the SlowFacts blog, decided to do a little research and see for himself. What does the data say? The truth may surprise you. Plus, why Rob gave up his Glock for an M&P, and Dean gave up his M&P for a Glock.