Is the rear sight on the barrel itself or on the toggle train?
If on the barrel itself, then this sounds like a gunsmith special. Perhaps the muzzle area of the original barrel was damaged and the barrel had to be cut down. The sight radius can't be more than 2" if this is the case.
If the rear sight is on the toggle train, then it is a Naval toggle train on a 4" barreled gun.
Photos would help greatly in determining what you have.
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