TGSCOM Inc. , an online gun wholesaler based in Green Bay , Wisconsin , sold Sodini an empty Glock 9 mm magazine and magazine loading apparatus used in the attack . TGSCOM sold a used handgun to Seung-Hui Cho , who subsequently used it during the 2007 Virginia Tech shootings . TGSCOM also sold an empty magazine and a holster to Steven Kazmierczak , who shot and killed five people at Northern Illinois University in 2008 . TGSCOM closed in 2012 , having become the subject of investigations by the U.S. Bureau of Alcohol , Tobacco , Firearms and Explosives , the Wisconsin Better Business Bureau , and Green Bay police
Virginia Tech shootings
Virginia Tech shooting
2009 Collier Township shooting