More than a year ago, a police investigator in Garland, Texas, alerted the Bureau of Alcohol, Tobacco and Firearms (ATF) about a concerning Instagram post. The post reportedly featured a picture of 16 "Glock switches" for sale, small devices that can be attached to Glock handguns to convert them into fully automatic weapons.

Explained: Lethal device that turns handgun into machine gun sold openly on Twitter, Facebook

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gun modification

Explained: Lethal device that turns handgun into machine gun sold openly on Twitter, Facebook