Fantastic story for sure. I would love to see a listing and picture show of various expedient wepons like the Richarson "Slam Fire," Liberator, Muffler Tube Mortors, Tire Tube guns, Pen Guns, Home made STEN guns etc. I find it fascinating what human conditions endure that people out of nothing build items for defense and resistance.
I love the story where the Jewish people could not buy ammo, so they bought Lipstick cases by the thousands and converted them into usable ammo for captured Mausers.
The human spirit is a high motivator and if this story of 20 Nazi German officers killed via an home made weapon is true and can even be slightly documented, it is a case for the Holocost Museum and a case for celebration of yet another win over oppression. I would love to read the entire story from front to back.
I personally celebrate all peoples ( especially Jewish) survival in such harsh conditions and weep for those that did not survive. Sadly, their (all oppressed peoples) fight is not yet over.
I suspect if the weapon is real, it would be a 4mm or 5mm piece. I also wonder if the ammo was commercial or home made.
The Liberator was made from stamped steel and a tube and I have seen examples of home made ones made from Pie Plates down in basements and in the woods workshops. It is actually harder to make a rim fire weapon than it is a centerfire weapon due to type of primer and the measurments needed for exact hit of the rim.
I have made a a few shop expediant weapons in the past just to see if I could and found it much easier to make a 9mm or .45cal pistol or a shotgun out of two pipes and a nail into a slam fire weapon than it was to make a rim fire weapon.