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There is a possibility that that is a true "last ditch" rifle, chambered for the 8mm Nambu pistol cartridge. And if it is, it is far from worthless. I recommend you take it to a gunsmith and have a chamber cast made. Then compare it to an 8mm pistol cartridge. If none is available, it would be close to a 7.62 Russian pistol cartridge (7.63 Mauser) or a .30 Luger cartridge. (Neither would be the right cartridge, but the 8mm Nambu is a bottle neck pistol round of the same type, so you can get an idea.) If the gun is chambered for something else, get the dimensions of the chamber and we will try to help.
Jim
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