Model 97 riot & Model 12 riot
Lurch37, your gun does sound like a WW2 US Military riot gun. The "U.S." only marked receiver would be correct for a gun that early.
Rdavis, your Model 12 also is a WW2 riot gun. Most of them fall into the same serial number range as your shotgun and were made around 1942. The barrel on your gun should be marked just like the Model 97 with a two digit date (e.g., 42 or 43) on the underside of the barrel near the receiver extension. It's difficult to see because the magazine tube is often in the way. If you can't see it, shine a flashlight in between the barrel and mag tube.
Can either of you post photos?
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