In the Second World War, a large number of weapons were used which were far less dangerous to the enemy than they were to their own troops. The 12 most catastrophic malfunctions are:
Smith & Wesson Model 1940 Light Rifle
Sounds unbelievable, but it's true: in 1940, the British commissioned Smith & Wesson to develop a light and easily mass-produced rifle for 9mm ammunition. S & M did everything to achieve exactly the opposite of the desired one. All the main components of the rifle are made of solid steel blocks. This means that mass production is already considerably more difficult than in punched parts. Moreover, it weighs so incredibly much. And of the cost we do not even begin to speak. The worst thing is this gigantic magazine. At first glance, you think it would contain an incredible number of patrones. But on closer inspection you see that it was a kind of container for 20 round magazines, which were ejected individually after use over a chute backwards. That means you had to disassemble the complete rifle in case of any malfunction. Weirdly unpractical when it has to go fast.
Breda Modelo 30
As the name suggests, an Italian development that was intended to replace the almost medieval arms of the Italian army. The magazine at the side was not interchangeable. It was loaded individually with brass or steel clips. Thus, if something has happened to the magazine, e.g. A sand grain, the gun was down. So not enough, it lit in a closed "box" inside, so that it got hot extremely fast and cooled very slowly. And as if that were not enough, it was designed for 6.5x52mm Caarcano ammunition, which is, so to speak, a synonym for inaccuracy.
Ross Riffle
The Canadians have already noticed in the first world war that this weapon is absolute garbage and therefore they gave it in the 2nd World War only to people who should have a weapon, but they will probably never use it (for example French). The rifle was not reliable and the closing mechanism was destroyed by the slightest contact with dirt. That was not enough, if you had the smallest mistake in the locking mechanism, it did not work. In other words, the ball went in exactly the opposite direction, and from then you was a Canadian pirate. And everyone knows that Canadians are not a good pirates: "Please give us your treasure, or it doesn't fit right now? Well OK we'll come back later, sorry."
M1910 Glisenti
This is an ugly side weapon of the Italians from the First World War, which was used with some new "interesting features" for the Second World War. It took 7 years (!) To design them and everything that came out was weak, unreliable and unbalanced. The closure was so unstable that it could handle no 9x19mm Luger ammunition, but extra weaker 9x19mm Glisenti ammunition was needed. This and the small visor made the famous for its unaccuracy. Not enough, she often fell apart.
Chauchat
Again the name leads to the right track. This rifle was developed by the cheese friends. Actually used in the First World War, it was then also used in the Second World War. It is thought that the concept was born of a few peasants, who had never even had to deal with weapons and were suddenly in the workshop and were to be creative. That would explain a lot. One of the features was huge holes in the magazine, just to not resist water or dirt. With over 9kg it was extremely heavy, despite the many holes. When it was additionally upgraded for larger calibers, this of course became even worse. The rifle was always delivered with these supports at the front, so that it could be left intact and ready for the arriving Germans. Or to attach the White Flag to it.
Type 89 Knee Mortar
Even if it is weak and ugly, you can only with aim difficulty with it, 5kg are quite bulky, the shots were only little more than New Year's Eve firecrackers - it is not therefore in the list. The reason is simply the name. Knee. In contrast to the suspicious name, it was not intended to be applied to the knee. Unfortunately, nobody told this to the Americans. So they put it on the knee. And as a result the bones broke regularly.
That were only six of the worst WW II Weapons, in the next days I will release a scond part!
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Thanks for reading. I hope you like it :) Excuse me if my English is not very good, but I am not a native speaker. Sources: Google Pictures and Wikipedia