Probably the most surprising statistic I have seen is from Table 13 on page 13:
In 1997, 9.9% of those in state custody and 7.6% of those in federal custody possessed single shot firearms when arrested. In 2004, the percentages were 7.5% and 8.2%, respectively.
SINGLE SHOT FIREARMS? What type of moron packs a single shot firearm when up to no good?