Make sure to first have SuperBLT, and BeardLib installed. Click the links in the dependency list.

Optional video tutorial for installing SuperBLT, BeardLib, and mod_overrides mods: https://youtu.be/rin_sjSJIkg

1. After downloading the mod, use a program such as 7zip or WinRAR to extract the main folder of the mod.
2. Navigate to assets/mod_overrides. The assets folder is supposed to be in your game's installation folder (don't know where that is? click here). Create the folder if necessary
3. Move the main folder of the mod from step 1 to the folder you navigated to in step 2.

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Extract this scope into mod_overrides.

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Modern Sights: Extract into mods.
If you try to use this scope without Modern Sights, you will only see blank black lenses.

CAFCW: Extract into mod_overrides.
CAFCW is for supported custom weapons, as is usual with custom optics.