Remington parked & blued hardware

[EO1]

I have seen 3 Remington upper bands and there are 2 different finishes I have observed. One had a gray parked finish which I figured a fairly recent park job. The other 2, one of which is on my 3.05m Remington, are black and hard to distinguish whether they were blued or parked. Which was the original finish ?

[John Beard]

Remington milled upper bands were dark olive parkerized.

J.B.