For the second time in almost as many weeks, a mass shooter used an AR-15-style rifle to kill innocent Americans. On May 14, PG allegedly used a variation of the AR-15 to shoot 13 people, 10 of them fatally. Just 10 days later, SR carried an AR-15 and a handgun into Robb Elementary school in Uvalde, Texas, where he allegedly shot and killed 21 people and wounded over a dozen others.