All right, found some stats for gun homicides specifically:
And where did the bad people who did the shooting get most of their guns? Were those gun show "loopholes" responsible? Nope. According to surveys DOJ conducted of state prison inmates during 2004 (the most recent year of data available), only two percent who owned a gun at the time of their offense bought it at either a gun show or flea market.
About 10 percent said they purchased their gun from a retail shop or pawnshop... and another 40 percent obtained it from an illegal source.
http://www.forbes.com/sites/larrybel...rimes-plummet/
So far more homicides are happening with guns the criminal(s) bought from an illegal source than with guns the criminal(s) bought legally from a store.