The bill amends Title 18 of the Pennsylvania Consolidated Statutes by adding a new section, 6143, which addresses the offense of undetectable firearms. It establishes that it is unlawful for any person to manufacture, import, sell, ship, deliver, possess, transfer, or receive a firearm that is constructed entirely of nonmetal materials or one that lacks at least one major metal component, such as a barrel, slide, cylinder, frame, or receiver. The bill specifies that such firearms must not be detectable by standard security measures, including walk-through metal detectors and airport screening devices.

Violations of this new provision are classified as a felony of the third degree. The bill also includes definitions for key terms, such as "major component," which encompasses the barrel, slide or cylinder, and frame or receiver of a firearm. The act is set to take effect 60 days after its passage.