The sights are not lined up. To fix this, edit weapons_assaultrifle_mk2.meta in
mods\update\x64\dlcpacks\mpgunrunning\dlc.rpf\common\data\ai

Search "FirstPersonScopeOffset" and replace the 2 rows with these

<FirstPersonScopeOffset x="0.000250" y="0.125000" z="-0.005000" />
...
<FirstPersonScopeRotationOffset x="-0.450000" y="0.000000" z="0.000000" />