Hi Tim, Welcome to the forum! Your first supposition is correct, someone assembled this gun from parts, it never left the factory this way. Your photos are not the clearest, but as far as I can tell the frame is from a 1917 Navy (a short frame gun) and the receiver is from a long frame Navy, most likely a 1908. Many of the smaller parts are from yet other guns, and the 6" barrel is a non-Navy replacement.
Regards, Norm
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