I have a16”, A2 upper with a stainless steel barrel and 5.5" FH permanently attached. I've been told the barrel an Olympic Arms. The color is black. Shoots very well.
It looks like the upper in the Bushmaster website. I borrowed this photo from the Bushmaster website.
I'd take $450.00 for it with bolt carrier assembly & charging handle, plus shipping and insurance to the lower 48 states.
I got it from a U.S. Marshal. It was on a L.E.O. lower.
If you want, IM me with your e-mail address and I'll send you actual photos of the upper. Colt_SBR