The speed at which the United States geared up for World War II in the days after Pearl Harbor must be the paramount industrial wonder of the 20th century. Peacetime manufacturing and occupations quickly became part of the war effort with an agility that seems impossible today. Many manufacturers with no experience in small arms were tasked with converting all or part of their operations over to produce them. Singer Manufacturing, Rock-Ola, and several divisions of General Motors are among these well-known to have made the hasty transition….