Where is the magach 6 gunners sight?

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Here is another angle
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the magach 6 from the magach 3 and it only hides the gunners sight when your using the xray in a game

I believe that’s because X-ray in matches only shows the critical optics (i.e. the ones that have names and values when viewing in X-ray in the hanger), since only those are considered modules that can be damaged. The tube next to the barrel isn’t the gunner’s sight; its just a backup sight (well, it would’ve been a backup sight IRL, in WT it’s just decoration), hence it’s hidden in matches.