Here are some statistics on accidental shootings from the Law Center to Prevent Gun Violence (here):
In 2010, unintentional firearm injuries caused the deaths of 606 people.
From 2005-2010, almost 3,800 people in the U.S. died from unintentional shootings.
Over 1,300 victims of unintentional shootings for the period 2005–2010 were under 25 years of age.
People of all age groups are significantly more likely to die from unintentional firearm injuries when they live in states with more guns, relative to states with fewer guns. On average, states with the highest gun levels had nine times the rate of unintentional firearms deaths compared to states with the lowest gun levels.