"The Glock 19 Jared Lee Loughner allegedly used to try to assassinate Rep. Gabrielle Giffords is a popular firearm around the world.... Kristen Rand, legislative director of the Violence Policy Center, ...said the Glock 19 has been used in other mass killings, including the Virginia Tech shooting in April 2007. In that incident, Seung-Hui Cho used a Glock 19 and a Walther P22 rifle to kill 32 students and take his own life.... Loughner was allegedly able to fire at least 20 rounds from his 33-round clip, according to [Paul] Helmke [president of the Brady Campaign to Prevent Gun Violence]."