The sights are not lined up. To fix this, edit weaponspecialcarbine.meta in
mods\update\update.rpf\dlc_patch\mpbusiness\common\data\ai

Search "FirstPersonScopeOffset" and replace the 2 rows with these

<FirstPersonScopeOffset x="0.000000" y="0.000000" z="-0.046500" />
...
<FirstPersonScopeRotationOffset x="-0.500000" y="0.000000" z="0.000000" />