"Incidentally, the FBI’s Uniform Crime Report shows that even though there are about 47,000 shooting deaths annually – mostly crime-on-crime – there are more than 2.5 million incidents of average Joe and Josephine Citizen using their gun to stop a crime, based on reports handed in to the FBI by law enforcement nationwide."
According to the FBI, there are about 11,000 homicides with firearms per year in the US, and another few hundred "justifiable homicides" with firearms by police and private citizens. So 36,000 of the firearms deaths are nothing to do with crime, and are either suicides or accidents.
As to the claim reports handed to the FBI show 2.5 million crimes stopped by guns*, the FBI has nothing to do with such reports. They only collect data on a subset of crimes in the US, and not on crimes prevented, apart from those where the criminal is killed (justifiable homicide)
I believe the 2.5 million figure is from one of the pro gun writers, either Kleck or Lott. I suppose it makes it look better to claim it's from an official source.
The only official study I've seen into the rate of firearms use in self defence in the US is:
"Guns and Crime: Handgun Victimization, Firearm Self-Defense, and Firearm Theft" which is available on the DOJ website:
http://www.ojp.usdoj.gov/bjs/abstract/hvfsdaft.htmThat gives figures for the early 90s:
"In 1992 offenders armed with handguns committed a record 931,000
violent crimes."
"On average in 1987-92 about 83,000 crime victims per year used a
firearm to defend themselves or their property. Three-fourths of
the victims who used a firearm for defense did so during a violent
crime; a fourth, during a theft, household burglary, or motor
vehicle theft."
Fwiw, there's a simple reason for the dramatically higher rate of defensive gun uses in surveys such as Kleck's. If a survey finds about 2.5 million such instances a year, it equates to about 1% of the US adult population. Think there's any chance if you phone people and ask if they've defended themselves with a gun, 1 in a 100 might lie?
There's ample evidence that's the case. Kleck, for example, records that 8% of cases resulted in the defender shooting and hitting the criminal. That would be 200,000 wounded or killed criminals a year. The FBI only records about 250 justifiable homicides a year.
*if "guns don't kill people, people kill people" then how do "guns stop crime"?