CAMPBELL — Authorities announced the arrest of a man they say was making illegal firearms, including ghost guns, out of his Campbell apartment, which was revealed when police paid him a visit to check on his compliance with his domestic violence probation.

The discovery was made this week as Santa Clara County law enforcement agencies conducted a sweep — timed with Domestic Violence Awareness Month — focused on ensuring people were abiding by the conditions of their probation supervision.

It also coincided with the signing of a new California law that bans the sale of Glocks and other semi-automatic firearms that can be readily converted for automatic fire with the addition of a switch. The new legislation was almost immediately challenged in court by prominent gun-rights organizations.

Prosecutors on Friday charged a 28-year-old man with more than 30 felonies alleging crimes including machine gun possession, manufacturing machine guns and felony gun possession, according to the district attorney’s office. He was also charged with child endangerment based on allegations that guns and gun components were within reach of two children living at the home.

Officers and personnel from San Jose and Santa Clara police, the sheriff’s office, county probation, and DA investigators — many of whom form the county’s Gun Violence Task Force run by the DA’s office — visited the Campbell man’s apartment and quickly found an array of guns and gun-making machinery, authorities said. That included two loaded guns, three nearly-completed guns, and 35 devices designed to give semi-automatic firearms the capability of fully automatic gunfire.

Additionally, while they were on scene, the team reported finding a 3D printer inside a closet making gun parts.

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All of the guns found at the apartment were described by authorities as ghost guns, meaning they had no serial numbers — allegedly with no intention to add them — and therefore could not be easily traced and tracked by law enforcement.

“Our task force shut down a busy criminal ghost machine gun factory in the middle of an apartment building,” District Attorney Jeff Rosen said in a statement. “The defendant who was flooding our community with illegal weapons is now behind bars.”

Relatedly, the state and DA’s office are pushing for the increased use of gun-violence restraining orders, a red-flag measure enacted in 2016 that allows law enforcement and select actors to seek the temporary disarming of a person who has exhibited specific threatening behavior and is known to be armed, subject to investigation and a judicial review. Santa Clara County, led by the Gun Violence Task Force, has topped the state the past two years in securing GVRO’s, but elsewhere in the state the adoption of the measure has been meager to middling, according to California Department of Justice data.