Firearms Detection Act of 1988

Firearms Detection Act of 1988 - Amends the Federal criminal code to prohibit the manufacture or importation of any plastic firearm unless the barrel of such firearm is constructed, in whole or in part, of a metallic substance and is susceptible to being detected by a magnetometer, or: (1) certain identifying information is engraved, cast, or stamped in a metallic substance and is susceptible to being detected by a magnetometer; and (2) the polymer portions of the frame or receiver, barrel, and slide or cylinder have been infused with a compound sufficient to render such firearm capable of being detected by airport security x-ray systems.

Defines the term "plastic firearm" to mean a firearm, the frame or receiver, and slide or cylinder of which is constructed entirely of a polymer or ceramic.

States that no provision of this Act shall apply to: (1) any firearm manufactured, imported, or possessed prior to the date of enactment of this Act; or (2) conduct by or under the authority of the Federal or State governments.

Requires the detection devices at all federally-controlled airport security checkpoints to be set to detect all existing firearms manufactured in, or imported into, the United States. Allows any Federal agency with jurisdiction over security operations to provide security personnel, equipment, and procedures sufficient to ensure the ability to detect all such firearms.