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@bewdabob
1. Download and extract the mod.
2. In the mod, there are two other folders: "data files" and "model files", open the "data files" folder.
3. In the "data files" folder, there are two META files: "weaponanimations" and "weaponheavyshotgun". Open the META file named "weaponheavyshotgun".
4. In the "weaponheavyshotgun" META file, find the following:
<Item>
<Name>COMPONENT_AT_SCOPE_LARGE</Name>
<Default value="true" />
</Item>
5. Change <Default value="true" /> to <Default value="false" />
6. Save and exit out of the META file.
And from here, just follow the install directions to installing this mod.