Police say up to 80 per cent of a working gun can be made using a 3D printer, and that the remaining parts can often be bought legally. They're warning parents to know the risks.

A state investigation is probing the spread of "ghost guns" and 3D-printable firearms in New Jersey. Pictured here are gun parts made by state investigators using a common 3D printer.

3D-printed guns are the types of weapons that State Sen. Linda Stewart wants to target. However, she’s not confident she’ll get support, as any amount of gun control rarely does in Tallahassee.