It's 16" for the carbine, and a 14" barrel mounted to a frame with a carbine stock would be a Fed violation.
Although the frame will accept either type of stock (pistol or carbine) and any barrel length, the law says that any firearm that left the factory as a carbine cannot ever be converted to a pistol. If it left as a pistol, however, it CAN legally be switched back and forth.
In no instance, however, can you ever have a pistol barrel (sub-16") on a carbine frame.
Idiotic, I know; but we're talking the Gummint here. To them, it makes sense.
I solved the problem for myself by buying TWO frames. One is permanently a pistol and the other is permanently a carbine. Harrrumph and foooey on them.
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