Police found 12 times as many of the guns in 2020 than in the prior year January 15, 2021 | 6:48 pm Pictured is a "ghost" gun recovered from a minor by the Montgomery County Police Department on Dec. 30. Ghost guns are usually undetectable and made out of plastic or fiberglass. The guns can be purchased without a background check. Photo from Montgomery County Police Plastic, fiberglass and undetectable “ghost guns” — a “do-it-yourself” version of firearms — are becoming a more popular and available way to purchase an untraceable gun without a background check. In 2020, the Montgomery County Police Department found 73 ghost guns — 12 times as many as the year prior, when six were found.