BETHEL ISLAND — Task force agents raided a residence Thursday and seized assault rifles, handguns, rifles, magazines, ammunition and a silencer, authorities said Friday.

Agents arrested 57-year-old Jeffery Irvine in the raid, which authorities said was the culmination of a month-long investigation by the Contra Costa Anti-Violence Support Effort task force. The raid happened at a residence in the 2000 block of Taylor Road, authorities said.

A member of the team from the Pittsburg Police Department received information from the state Armed Prohibited Persons System that a resident in Bethel Island had registered firearms in his name despite being prohibited, spokesman Jimmy Lee of the Contra Costa Sheriff’s Office said.

Irvine is suspected of manufacturing an assault rifle; possession of an assault rifle; being a prohibited person in possession of a firearm; being a prohibited person in possession of ammunition, possession of a ghost gun and illegal transfer of a firearm.

According to Lee, agents took into evidence four AR-15-style assault rifles; nine handguns, 10 rifles, four lower receivers, one shotgun, one silencer and 20 large capacity magazines. They also took approximately 5,000 round of ammunition.

Irvine posted $240,000 bail and was not in custody Friday afternoon.