Williams continued working at Winchester on the Model G30, a light machine-gun version known as the Winchester Automatic Rifle (WAR) intended to replace the M1918 Browning Automatic Rifle (BAR), and a .50 caliber anti-tank rifle version. As the design of several of these firearms neared completion, the war's end in August 1945 and subsequent budget cutbacks ended these projects. Williams assisted Winchester throughout the war on a number of smaller projects, including the design and development of the rear flip sight for the M1 carbines.