Why Loughner -- who'd been rejected by the military for his past drug use and arrested on drug charges -- was free to buy a 30-round magazine is a mystery. Almost as much a mystery, frankly, as why Glock even markets them: They have no discernible civilian efficacy -- and damned little military utility. Yet sales of the magazines reportedly are way up around the country in the wake of the Tucson massacre. Here's an opportunity for the NYPD -- and every big-city police department in the nation -- to help turn this around by sending Glock a simple message:...