A gun store in Texas hosted a back-to-school firearms sale just weeks after a mass shooting at an El Paso Walmart killed 22 people. Boyert Shooting Center, in Katy, outside Houston, posted a sign on its marquee earlier this month that said: "Back to school sale August 13th-18th Up to 50% off firearms." The gun range also promoted the sale on Facebook, highlighting a $999.99 discount on a semi-automatic .50 caliber gun that the shop called a "beast of a rifle." Local resident Michelle Simons, who took a photo of the range's sign, told KTRK she thought the sign was...