In “Gun Valley,” the swath of Western Massachusetts and Connecticut where industrial gun making in America began, business is booming once again. Home to Savage Arms in Westfield, Smith & Wesson in Springfield, and Colt in Hartford, the Connecticut River Valley includes dozens of firearms manufacturers and suppliers. With record sales and profits, manufacturers are racing to hire more workers--growth that has real economic implications for a struggling region. Take a rare and revealing look inside the humming Savage factory and meet the people making the guns to meet all this new demand. This gun boom is challenging the long-held assumption that manufacturing is firmly in New England’s past. And it will force critics to reconcile their dislike of guns with their support for good blue-collar jobs.