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 ?