1941 Soviet "ghost" machine gun used to cover retreating Soviet forces during the Winter War. The guns were equipped with extra long belts and rigged to fire at intervals.
WW2 Finnish camouflaged road - photo
WW2 improvised anti-aircraft gun - photo
M61 Vulcan cannon feed system - GIF
Gardner gun firing action - GIF
Northrop Grumman M230LF chain gun - GIF
Gatling gun made from SKSs - GIF and video