The sights are not lined up. To fix this, drag and drop weapongusenberg.meta provided or edit
it in mods\update\update.rpf\dlc_patch\mpvalentines\common\data\ai

Search "FirstPersonScopeOffset" and replace the row with this

<FirstPersonScopeOffset x="0.000000" y="-0.080000" z="0.021500" />