Exactly, but on top of that, there are some subtle differences that one can point out to distinguish a 4006 from a 5906, or from a 639, 659, 4506 or any of the other S&W classic autos. None of the guns I've seen meet the 4006 criteria, though the one in JAG might, but I still believe based on the 9mm argument that it's a 5906 there too.
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