A: Quantico, Virginia. Ever wonder who has John Dillinger’s revolver? “Pretty Boy” Floyd’s 1911? It’s the boys at the FBI’s reference firearms collection. A storehouse of over seven thousand guns they use to help solve crimes referred to the feds. “Housed at the FBI Laboratory in Quantico, Virginia, the racks of weapons are not a musty exhibit of museum pieces, though some rare items would certainly qualify. Rather, the ever-expanding collection is a hands-on reference catalog for the Lab’s firearms examiners to study, take apart, reassemble, and test fire to support investigations. By maintaining a working library of virtually every handgun and rifle—along with a database of their unique toolmarks—examiners are able to identify and substantiate for investigators what weapons may have been used in criminal acts.”