A Jurupa Valley resident was arrested on December 13, 2025, after deputies from the Jurupa Valley Sheriff’s Station Special Enforcement and Problem-Oriented Policing Teams received information about alleged illegal firearm manufacturing and drug use at a home in the 5000 block of Steve Street.
Deputies obtained a search warrant for the residence. According to authorities, they seized 13 firearms—two of which had been reported stolen—and one short-barreled rifle. The search also uncovered 20 3D-printed lower receivers, several suppressors and large-capacity magazines, hundreds of rounds of ammunition, as well as a small amount of methamphetamine and drug paraphernalia.
The suspect, Marco Ponce de Leon, age 37 and a resident of Jurupa Valley, was taken into custody and booked into the Robert Presley Detention Center. He faces charges including being a convicted felon in possession of a firearm and ammunition, possession of an assault weapon, manufacturing an assault weapon, manufacturing unserialized firearms, along with other weapons-related and drug charges.
Authorities state that the investigation is ongoing. No further details have been released at this time. Anyone with information related to this case is encouraged to contact Deputy Alexis Sanchez at the Jurupa Valley Sheriff’s Station by calling (951) 955-2600.
“The Jurupa Valley Sheriff’s Station is committed to serving the members of our community and keeping our neighborhoods safe. Community Safety is a shared responsibility, and we encourage our members to report any suspicious activity to law enforcement. By working together, we can prevent crime and help ensure a safer community for all. If you see something, say something.”
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