Of course, the actual news story that brought me to this study, said something even more trite; that 10 states account for nearly half the guns bought and taken across state lines to commit a crime.
The reason this is particularly trite is, of course, that 10 states (California, Texas, New York, Florida, Illinois, Pennsylvania, Ohio, Michigan, Georgia, North Carolina) account for more than half the population of the United States.
That being said, the actual study, done by the Mayors Against Illegal Guns coalition has some slightly less obvious information in it.
Specifically, three of those states (Arizona, Indiana, Virginia) are not in the top 10, and Georgia, which is only the 9th largest state, has been the #1 offender in this category for the last four years.
Moreover, using the data provided, I ran a correlation test on the number of interstate criminal guns sold per 100,000 state residents with the score that state receives for its gun laws by the pro-gun control Brady Campaign.
The result was a -0.57 correlation, quite high.