In a typical week, American firearms dealers sell 4,000 handguns to people buying at least two — and sometimes dozens — at once. Some customers are collectors investing in rare weapons they hope will increase in value. Some are buying gifts for Christmas, the peak season for multiple-handgun purchases. But others who buy handguns by the handful from licensed dealers provide what law enforcement experts call a persistent source of "crime" guns in the United States.... (GunPolicy.org)