To answer heavyd
HeavyD,
This reply comes a little late, but I've just recently found the high road.
I also have a Win 120 Ranger 12 ga, and its the exact same gun as yours...with the checkering around the grip. Mine also has Winchoke. Came with MOD and I've added Full to the lineup. Anyway, just wanted you to know.
I bought this gun brand new in the late 80's...from a Kmart of all places. Has been a great gun and though I've shot maybe 50 boxes of shells through it in that time...it performs as expected. Given time, I may be able to locate the original "manual" and paperwork...as I never throw anything away.
I could never find specific info in a gun book on this particular variation before, and so I was curious about it too. Thanks for the info.