 This is Morning Edition from NPR News. I'm Sasha Pfeiffer. And I'm A. Martinez. An unusual type of vending machine is popping up at supermarkets around the country. They don't have snacks or drinks. They're selling shotgun, rifle, and handgun rounds. NPR's Rachel Treisman explains. A Texas company has installed eight ammo vending machines in Alabama, Oklahoma, Texas, and, as of this week, Colorado. American Rounds CEO Grant Majors says even more are on the way.