MINNEAPOLIS (WCCO) — A self-proclaimed member of the anti-government “Boogaloo Bois” movement pleaded guilty Wednesday to illegally possessing devices used to convert semi-automatic guns into automatic ones.

According to the U.S. Attorney’s Office in Minnesota, 27-year-old Michael Dahlager of St. Cloud showed an FBI source two 3D-printed “auto sears,” which are inserted into firearms to make them fire automatically with a single trigger pull.

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Authorities arrested Dahlager in April and found six more auto sears and a suppressor in his home and vehicle, the attorney’s office said.