A row of Sig Sauer semiautomatic pistols on display at the NRA's Great American Outdoor Show at the Farm Show complex in Harrisburg, on Feb. 11, 2026. (Photo by Tim Lambert/Pennsylvania Capital-Star)This story was originally published by The Trace, a nonprofit newsroom covering gun violence in America. On May 18, 2018, a teenager at Santa Fe High School in Texas walked into the school armed with his father’s guns and opened fire, killing eight s…