I've noticed this on the EGLM variants of the Katiba, MX 3GL Rifle, MK20 and also on the Skorpion Evo SMG, and there are probably some more weapons in which this happens.
The nonremoveable ironsights which appear while scoped, have the color of the sky
(it appears both when using 1x zoom and 4x zoom) {F20137} {F20138} {F20139} {F20140} {F20141} {F20142} {F20143} {F20144} {F20145} {F20146} {F20147} {F20148} {F20149} {F20150}
This is still around with the MX3GL in the campaign. As the MRCO is the only actual magnified scope available for the majority of missions it's pretty glaring.
Hope they will fix it, because it is quite disappointing. I can not stop focusing on the blue sight in front. And the scope itself is pretty cool.
Disappointingly, this issue is STILL there (at least with the MXGL) as of today's update. It's hardly high priority but it looks to be the kind of thing that should be easy to fix and does look rather substandard.
This was reported on june last year, only gets assigned today, with no priority aparently. Well done BIS, i'm sure DICE and EA would be proud of you *claps*