For the last hour, in a backroom of a gun range in Arabi, Louisiana, I’ve been building Luigi Mangione’s gun. Well, not his, in the literal sense. The not-quite-finished firearm in my hands is very ...

A new crop of retailers is profiting more from limited-edition accessories that sell out in minutes, and promoting lifestyle gear to women, minority gun owners and the L.G.B.T.Q. community. By Thomas ...