"The article's description of the nuclear cannon is correct. This was a German invention and was under development in Germany during the latter stages of the war. A prototype was even built and it carried the German designation of DKM 44 (1). This very cannon was copied by the Americans and became the T-131 which fired a nuclear warhead (2)."
It claims that germans developed a nuclear cannon and US later copied it. To me, this seems to be just another addition to nazis-invented-everything/UFO myth. There might have been plans for DKM-44, but i really doubt that it was meant to be nuclear.
There seems to have been another Düsenkanone (jet-cannon?) of 88 variety with revolver type magazine for aircraft.
This reminds me of a somewhat similar American WWII recoilless weapon 105mm T9E2. I have seen just one description of this weapon and it seems to have been a special version of normal 105mm T9 recoilless howitzer with addition of autoloader and it was meant for some type attack aircraft. Firefly, could you shine your light on this or any other allied experimental recoilless weapon?
I have always been more interested in allied secret weapons than this nazi stuff...