Several gun stores report the largest increase in demand has come from the sale of high-capacity, 33-round magazine's simlar to the the one used in Saturday's attack. A number of online gun retailers list the magazines as sold-out or on back-order.
Jared Lee Loughner, the alleged shooter, reportedly used a Glock 9 mm pistol with a 33-round magazine in the attack that killed 6 and wounded 14 others, including Representative Gabrielle Giffords.
Greg Wolff of Glockmeister, a Mesa gun shop that specialzes in Glock handguns, said sales of the 33-round magazine doubled the day after the shooting.
Wolf said some cusomers have expressed concern that the sale of high-capacity magazines could become illegal. “It's because people get nervous...about them banning certain magazines that are high-capacity," said Wolf.
That concern likely stems from the Federal Assault Weapons Ban of 1994, which made it illegal to manufacture new magazines with more than a 10-round capacity for semi-automatic pistols. The Federal Assault Weapons Ban expired on Septemer 13, 2004 as a part of the law's sunset provision.
Wolff said he has already resupplied his inventory of 33-round magazines this week and expects to sell out again.