In a blow to the NRA, the Supreme Court has opted not to hear a trio of cases challenging federal and state gun laws. Two involved NRA-backed challenges to laws limiting gun rights for people under 21, Reuters reports. One of those was a Texas law banning 18- to 20-year-olds from publicly carrying guns; the other addressed decades-old laws against gun sales to those under 21. A third case involved consumers' ability to challenge gun-sale laws. The high court didn't offer comment on its rejection of the cases, the AP notes. In other court news: