Plane turrets got their combat debut in World War II but were nearly obsolete by the time the war ended as jet planes could fly too fast for most gunners to hit them.
Most turrets were scrapped after the war, but one enthusiast in Georgia is collecting those that survived and restoring them to working conditions.
In his workshop in Georgia, Fred Bieser has thousands of turret parts and, as of 2013 when this video was shot, had restored seven turrets. Most of them are kept in his workshop, but some have gone on display at military museums.
American ball turret gunner Alan Magee poses in his station. (Photo: U.S. Army Air Force)
In this video from Tested, Bieser takes a video crew through his workshop and shows the guts of turrets and how they worked.
The video includes a lot of cool history on turrets, like how pilots worked with gunners to ensure accuracy and how Britain and America used different technologies for power and control.