The increasing use of such weapons, often called "ghost guns," has raised troubling new questions about the easy availability ...

Ghost guns do not have serial numbers ... which aren't regulated and then they can build the gun themselves," Eric DeGree, a Special Agent in Charge with the Bureau of Alcohol, Tobacco, Firearms ...

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Ghost guns, however, are made of parts that the owner can assemble together. The critical component in building an untraceable gun is what is known as the lower receiver. Some are sold in do-it ...