Mark - Can you take some clear, up close pix and post them here? Include the water table (The flat part of the receiver that the breech end of the barrels rest on) and the underside of the breech ends of the barrels. The marks on those surfaces will tell us a lot about what you've got. To post pix, go to the FAQ section and type in "Post Pictures" and you will get an explanation so simple that I was able to follow it.
Good luck
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