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Unread 01-23-2016, 03:45 PM   #13
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Bill Murphy
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Well, George, does your extension rib have a concave top surface, or is it flat? If it is concave, it is made for a solid rib gun. If it is flat, it is made for a vent rib gun. What is the serial number of the barrels? That could be another clue.
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