From Reason:

In direct response to queries from Reason, who first directly notified Kleck of his error, he worked through and has since issued a revised version of the paper, published as was the original as a working paper on the Social Science Research Network. In the new version, Kleck re-analyzes the BRFSS survey data accurately as limited to a small number of states, and ultimately concludes, when their surveys are analyzed in conjunction with his NSDS, that their surveys indicate likely over 1 million defensive uses of guns (DGUs) a year nationally, compared to the over 2 million of his own NSDS.