However, Attorney General Kamala Harris said Thursday that more than 34,000 handguns and nearly 1,600 assault weapons are still believed to be held statewide by people who should not have them.
Most people bought the weapons legally but were later prohibited from owning guns.
But 12 people were arrested on suspicion of illegally owning assault weapons or grenades during a six-week sweep by the state Department of Justice in April and May.
Harris said 90 percent of the people who had guns seized were barred from owning weapons because of mental illness and 10 percent because of restraining orders or convictions usually related to domestic violence.
Source: The Associated Press via The Washington Post.