The Chicago Police Department traced the origins of about 50,000 guns that it recovered between 2001 and March 2012. More than half of those guns came from outside the state.
More than a quarter of the firearms seized on the streets here by the Chicago Police Department over the past five years were bought just outside city limits in Cook County suburbs, according to an analysis by the University of Chicago Crime Lab. Others came from stores around Illinois and from other states, like Indiana, less than an hour’s drive away. Since 2008, more than 1,300 of the confiscated guns, the analysis showed, were bought from just one store, Chuck’s Gun Shop in Riverdale, Ill., within a few miles of Chicago’s city limits
Among seized guns that had moved from purchase to the streets of Chicago in a year’s time or less, nearly 20 percent came from Chuck’s, the analysis found. Other guns arrived here that rapidly from gun shops in other parts of this state, Indiana, Wisconsin, Kentucky, Mississippi, Georgia, Iowa and more.
http://www.nytimes.com/interactive/2013/01/29/us/where-50000-guns-in-chicago-came-from.html?_r=0