.....always bites you in the ass.........
I was going to ask if this was a special order or not. Damn.
I think I misread a bit as well.
Sounds like the line on the receiver is a mold line, just not ground off as well as your other one. Interestingly, NONE of my Bushmaster have any hint of that line, whereas my DPMS has a very prominent mold line below the rear sight. The Bushmasters look smooth as glass.
The difference in markings could be a difference in vendors they are buying from.
Beat up is interesting.
Any way of posting pics?
I'd give Bushmaster a call. It sounds like they have changed vendors on the upper and the sights, and not for the better.