Kristopher Ervin, 41, was indicted for selling auto-sears that convert semi-automatic rifles into fully automatic weapons. Author: Troy Kless (First Coast News) Published: 7:08 PM EDT March 15, 2021 Updated: 7:08 PM EDT March 15, 2021 ORANGE PARK, Fla. — A Clay County man was indicted for selling hundreds of machine gun conversion devices. On Monday, Kristopher Ervin appeared before a judge for making more than a thousand items known as auto-sears which prosecutors say creates a dangerous loophole around gun laws, changing a weapon from semi- to full-automatic fire. The device also called a "lightning link" is a part that can be cut out of a credit card-sized piece of sheet metal.