A 20-year-old Oregon man has accused Walmart and Dick’s Sporting Goods of age-discrimination for refusing to sell him a rifle.

Tyler Watson filed Oregon county court lawsuits against the retailers on Monday, six days after they announced they would not sell guns to buyers under 21.The companies added the higher age restriction after the massacre at Marjory Stoneman Douglas High School in Parkland, Fla.

Oregon law allows state residents to buy shotguns or rifles as of age 18. Federal law also allows people 18 and older to buy rifles or shotguns from licensed dealers.

Watson’s lawsuits may be the first of their kind in the U.S., his attorney, Max Whittington, told The Oregonian/Oregon Live, media outlets that first reported the cases.