A routine Interstate 10 traffic stop in Kerr County on Saturday escalated quickly when deputies say they opened a vehicle and found four Barrett .50-caliber rifles inside, two of them with their serial numbers removed. The driver was booked on a state firearm possession charge and could be staring down federal counts as investigators take a closer look at the weapons.
Deputies from Kerr and Kendall counties pulled over the westbound vehicle on I-10 after reportedly getting conflicting stories about where it was headed and why, according to KSAT. That inconsistency led to a search of the vehicle, where deputies say they found the four Barrett .50-caliber rifles, including the two with defaced serial numbers.
The Kerr County Sheriff’s Office identified the driver as 45-year-old Sunshine Puentes-Rivas and said she "provided deputies with inconsistent information about her travel itinerary," which they say justified the search, KSAT reported. Puentes-Rivas, who the sheriff’s office says is not a U.S. citizen, was charged with one count of possession of a firearm, and authorities say federal charges are on the table.
Why investigators flagged the guns
The Barrett .50 is a massive, long-range "anti-material" rifle that has surfaced in federal gun-trafficking cases and is known to be coveted by Mexican drug cartels, according to international reporting in EL PAÍS. Weapons in this category have turned up in cross-border seizures and tend to be treated as high-value evidence when investigators suspect organized trafficking.
What the law says
Under federal law, it is a crime to possess, transport, or receive a firearm if the manufacturer’s serial number has been removed, altered, or obliterated. That prohibition is spelled out in 18 U.S.C. § 922, a statute federal prosecutors routinely lean on in trafficking and possession cases, as reflected in official text published on Law.Cornell.edu and in recent case summaries from the U.S. Attorney’s Office.
Kerr County authorities have not said whether federal agencies have formally stepped in. The sheriff’s office says the case remains under investigation and that more details could be released as any additional charges are filed. For now, Puentes-Rivas remains in custody on the state weapons charge while investigators decide whether to hand the matter off to federal partners.
