THERE THEY were, just below Martha Stewart and Paula Deen and Allure in the magazine rack at the supermarket: the gun periodicals. I bought three. Back at the place where I was staying — this was in upstate New York, a week ago — I pored over the ads and the editorial content, trying to understand what they were saying, and to whom. First, they want you to buy a gun. It will probably not be your first gun; it will be an addition to, and an improvement on, the gun or guns you already own. It may deliver “precision...