What is a ghost gun?

The Biden administration unveiled new regulations for "ghost guns" Tuesday in a move that advocates say will help reduce gun violence. The new rules will help law enforcement track and trace these firearms, which authorities say are increasingly involved in crimes.

Ghost guns are unregistered and untraceable homemade weapons that can be made with a 3D printer or assembled from a kit. According to the Bureau of Alcohol, Tobacco, Firearms and Explosives, such weapons are contributing to a rise in gun violence, reported CBS News' Jeff Pegues in February. The weapons can be produced for less than $200, though officials have put the average price at around $500.