Brandon Brown celebrates in Victory Lane after winning a NASCAR Xfinity Series auto race Saturday, Oct. 2, 2021, in Talladega, Ala. AP Photo/John Amis An NBC Sports reporter mistook profane anti-Biden chants at a NASCAR race as "Let's Go, Brandon!" A South Carolina firearms company is selling an AR-15 lower receiver inscribed with the slogan. Florida- and Utah-based firearms companies are selling "Let's Go, Brandon" magazines. Multiple firearms companies throughout the country are manufacturing and selling AR-15 parts and magazines inscribed with the anti-Biden phrase, "Let's Go, Brandon," NBC News reported. The phrase originated at Talladega Superspeedway on October 2