
On Monday, shares in Sturm, Ruger & Company, the Southport, Conn., maker of Ruger handguns and rifles, rose 3.5 percent, then an additional 2.1 percent on Tuesday. Last year, the day after a gunman killed 49 people and wounded 53 at the packed Pulse nightclub in Orlando, Fla., on June 12, 2016, the gun maker's stock price swung up 8.5 percent. And it eventually rose 10 percent in the days after two attackers killed 14 people and wounded 17 in San Bernardino, Calif., on Dec. 2, 2015.