Following the arrest of four Philadelphia men selling “ghost guns,” state Senators Vincent Hughes (D-Philadelphia/Montgomery) and Wayne Fontana (D-Allegheny) reintroduced two pieces of legislation pushing to regulate undetectable and 3D-printed firearms.

Senate Bill 413 would amend the definition of a “firearm” in Pennsylvania’s Uniform Firearms Act to include 3D printed guns and partially assembled firearms, which are known as 80 percent receivers.

Senate Bill 414 would prohibit anyone from printing a 3D firearm unless they have a firearm manufacturing license from the federal g...