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Simmons Rib on a factory Super X 1 trap barrel ?

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I recently acquired a nice Super X1 with a barrel stamped Winchester Trap Full. But the rib is by Simmons. I know Simmons did a lot of ribs for barrels on Model 12's and Model 42's - but was not aware they did ribs on Super X1 barrels. Especially on a Trap barrel. There is nothing special about the rib i.e. high rib, etc. The receiver is serial numbered in the 4000 range. Anyone have any history on when/why Simmon's name is on the rib ?