What is a ghost gun? UnitedHealthcare suspect's gun may have been 3D printed.
Briefly

Investigators have increasingly linked ghost guns to crimes in recent years, and they have been the target of regulation efforts by state and federal officials.
Ghost guns are typically assembled at home using parts, kits or even pieces printed by 3D printers. Some 'buy build shoot' kits can be assembled into a working firearm in as little as half an hour.
Before 2022, ghost guns were not subject to the same regulations as other commercially purchased firearms, which helped fuel an explosion in their popularity.
This made them largely untraceable - and people who were prohibited from owning guns, such as felons, could readily obtain them.
Read at Boston.com
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