Colt Defender Shotgun

Weird and wonderful piece of machinery!
The Colt Defender Mark I, an eight barrel, 20 gauge shotgun, chambered for 3 inch magnums.
The Colt Defender was designed by a man named Robert Hillberg in 1967 and was an outgrowth of an earlier weapon called the Liberator. They were both intended as weapons to arm a resistance, guerrilla, or insurgent force. As this was the Cold War era, the enemies these people would be fighting are assumed to be the forces of World Communism. There were some simple criteria for the weapons. They needed to be very inexpensive, easy to operate and maintain, and have a good first shot hit probability and a good first hit kill probability. Hillberg felt that a shotgun was good for all of these criteria. They are relatively simple and cheap to manufacture, when using a load like buckshot, they are both easy to use and very lethal at short range. Both the Liberator and Defender were intended to be used by forces with little or no training and so long range shots were not a part of its design. An interesting feature of the design is that the weapon is able to fire like a semi-automatic manner, without having the mechanically complexity (and inherent occasional failures) of most semi auto designs. Like the Liberator before it, the Defender possessed semi-automatic like fire without the complexity of the semi-automatic gun. It was extremely simple to operate and very robust. Hillberg believe that the double action trigger mechanism was ideal for law enforcement applications, as it minimized familiarity and training requirements.
http://homemadedefense.blogspot.com.au/2010/02/weird-guns-colt-defender-mark-i.html