FILE - This March 3, 2013, file photo shows handguns displayed in Sandy, Utah. Some of the numbers being hurled around in the gun control debate passed their freshness date eons ago. Perhaps none is more prominent than the claim that 40 percent of gun sales take place without background checks. The statistic is ubiquitous these days and cited as gospel by a variety of public figures and gun-control advocates, President Barack Obama among them, but it is 20 years old and was not much more than an educated guess at the time. (AP Photo/Rick Bowmer, File)

Associated Press
FILE - This March 3, 2013, file photo shows handguns displayed in Sandy, Utah. Some of the numbers being hurled around in the gun control debate passed their freshness date eons ago. Perhaps none is more prominent than the claim that 40 percent of gun sales take place without background checks. The statistic is ubiquitous these days and cited as gospel by a variety of public figures and gun-control advocates, President Barack Obama among them, but it is 20 years old and was not much more than an educated guess at the time.  (AP Photo/Rick Bowmer, File)
FILE - This March 3, 2013, file photo shows handguns displayed in Sandy, Utah. Some of the numbers being hurled around in the gun control debate passed their freshness date eons ago. Perhaps none is more prominent than the claim that 40 percent of gun sales take place without background checks. The statistic is ubiquitous these days and cited as gospel by a variety of public figures and gun-control advocates, President Barack Obama among them, but it is 20 years old and was not much more than an educated guess at the time. (AP Photo/Rick Bowmer, File)
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