Nancy Lanza loved guns, and often took her sons to one of the shooting ranges here in the suburbs of northeast of New York City, where there is an active community of gun enthusiasts, her friends said. At a local bar, she spoke at times about her gun collection. It was one of those guns that was apparently used to take her life on Friday. Her killer was one of her sons, Adam Lanza, 20, who then drove to Sandy Hook Elementary School, where he killed 26 more people, 20 of them small children, the authorities said. He then shot...