That’s when they found a Polymer 80 handgun with no serial number — also known as a “ghost gun” — which had a laser attached to it, one round in the chamber and a 30-round magazine.

In the four years since Hawaiʻi made it a felony to manufacture or possess unserialized parts used to create firearms, the number of ghost guns that police are recovering has increased dramatically.

Ghost guns, often made with DIY kits and 3D printers, lack serial numbers, making them untraceable and raising concerns among law enforcement. Case in U.S. District Court in Erie highlights the ...

Much of the legislation focuses on ghost guns, which are privately manufactured and often 3-D printed, and switches, small pieces that can turn a semi-automatic gun into a rapid-fire weapon.