Yes, one of my favorites, as well. I had another RIA/SA hybrid, which I got from CMP in the early 2000s. RIA 413,950 with a 3.29 SA barrel. I sold that one when a Red Star Remington caught my eye.
I also have two more that relate to our discussion -- another Springfield, 1,294,444, whose receiver was either a finished RIA one or a rough forging.
The other is a NRA Sporter with a 1,295,379 serial number. John Beard told me that just about any 1,290,000 range Springfield has a receiver that started out at Rock Island.
"We make men without chests and expect from them virtue and enterprise. We laugh at honor and are shocked to find traitors in our midst."
--C.S. Lewis