Investors on Friday pushed the shares of gunmakers higher in what has become a typical reaction following a mass shooting. On the day after five police officers in Dallas were killed by a sniper, Smith & Wesson shares gained 2.8 percent, to close at $29.07. The company’s shares opened trading at an all-time high. Rival Sturm, Ruger & Co. saw its shares gain 4.9 percent, to $67.66.(Nypost.com)…[+]