But conservative judges may block common-sense measures for a long time to come.The right-wing political extremist who gunned down nearly two dozen people at an El Paso Walmart on Saturday and the man who shot and killed nine people only hours later in a downtown area of Dayton, Ohio, both unleashed their savage attacks thanks to military-style rifles. Just as culpable for the carnage, however, were the large-capacity magazines that enabled these shooters to discharge many rounds of ammo without reloading. Once all the rounds in a magazine are fired, reloading takes time. That chunk of time is often the...