| Interesting idea on the NEF or Rossi. I think they would be a great round for a pump action carbine, or a lever, due to their very short length, but I suppose straight blowback autos would be easier to make.
Ruger makes a carbine in 9mm and 40 S&W. There are also AR-15 uppers chambered in various pistol calibers. Olympic is one major manufacturer. Some folks are making homemade AK based carbines in both rounds, more so with 9mm. FALs too.
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