Police have accused Jared Laughner of using a handgun called a Glock to carry out the mass shooting in Arizona. Gun sellers in Arizona reported that sales of Glocks rose after the shooting. It is, afterall, one of the most popular hanguns in America. But how did that happen? We spoke to Christian Pearce, co-author of "Enter The Babylon System: Unpacking Gun Culture from Samuel Colt to 50 Cent.