Yours is definitely a combination of blued and phosphated finishes. "Greenish" is phosphated. "Black" is blued. You can do a detailed breakdown in your post #116 in the sticky thread:
Do you have a 1950 Long Branch?
Just refer to Post #1 for the details.
I would not go crazy removing the rust. It almost always looks worse under the camera flash. Start with oil and an old toothbrush. Sometimes "rust" turns out to be petrified oil, but probably not this time.
For some reason the magazines usually look the worst on these rifles. Must have been that way from the start, as they are usually late production.