New York may become the first state to bar gun companies from selling pistols that can easily be converted into machine guns. A proposed law, introduced Tuesday by Democratic state Sen. Zellnor Myrie, takes aim squarely at Glock. The Austrian company, whose polymer-framed pistols have played a dominant role in the handgun market since the 1980s, has faced growing criticism from gun safety groups for declining to modify a design that easily converts into an automatic weapon. “Any business...