The investigation revealed that a friend, Robyn Anderson, accompanied Harris and Klebold to a gun show in late 1998 since she was of legal age to buy a firearm. At the gun show, 18-year-old Anderson purchased two shotguns and one rifle for the two killers. Those same guns were later used in the Columbine killings.
Anderson denies any prior knowledge of their plans. No law, state or federal, prohibits the purchase of a long gun (rifle) from a private individual (non-licensed dealer). Because of this, Anderson could not be charged with any crime. If Anderson had purchased the guns from a federally licensed dealer, it would have been considered a "straw purchase" and considered illegal under federal law to make the purchase for Harris and Klebold.
The State of Colorado has a specific statute prohibiting anyone from providing or permitting a juvenile (under 18) to possess a handgun. Mark Manes sold his Intratec, model TEC-9, 9mm pistol to Klebold for $500. He also purchased two boxes (100 rounds) of 9mm ammunition for Eric Harris the night of April 19. Manes was charged with one count of unlawfully providing or permitting a juvenile to possess a handgun. Manes was also charged with one count of possession of a dangerous or illegal weapon because he had gone shooting with Klebold and Harris in March 1999 and had shot one of their sawed off shotguns.
Manes entered a plea of guilty to the charges and, on Nov. 12, 1999, was sent to the Colorado Department of Corrections for six years on the first charge and three years on the second charge, to be served concurrently.