In this Dec. 9, 2015, photo, sales associate Mike Conway, right, shows Paul Angulo a pistol at Bullseye Sport gun shop in Riverside, Calif. The massacre at Sandy Hook elementary school in which a mentally disturbed young man killed 26 children and teachers galvanized calls across the nation for tighter gun controls. But in the three years since, many states have moved in the opposite direction, embracing the National Rifle Association's response that more "good guys with guns" are what's needed to limit the carnage of mass shootings. (AP Photo/Jae C. Hong)

States expanded gun rights after Sandy Hook school massacre

The 2012 massacre served as a rallying cry for gun-control advocates across the nation, but many states have moved in the opposite direction…