A Fairfax man was arrested in an FBI raid Thursday to face an indictment on assault weapons charges.

Related Articles FBI raids Fairfax home in weapons case Michael Christian Gordon, 47, is charged with manufacturing and possessing an AR-15 rifle with a 10.5-inch barrel and no serial number. He is being prosecuted in federal court in San Francisco.

The case stemmed from a traffic stop by the California Highway Patrol on July 29. A tipster called authorities to report a potential drunken driver on southbound Highway 101, and the CHP stopped the car near Marin City.

While taking an inventory of the car prior to having it towed, police found an illegal assault weapon inside, said CHP Officer Andrew Barclay. Police notified federal authorities.

Gordon allegedly told police he made the weapon at home, said Fairfax police Chief Christopher Morin. At about 6 a.m. Thursday, the FBI executed the warrant at Gordon’s property on Tamalpais Road in a raid involving more than a dozen investigators, Morin said.

Developments from court on Thursday were unavailable and it was unclear whether Gordon was released pending further hearings.