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
mods
Two different versions. Main file works universally and doesn't have any dependencies. Drop this to your mod_overrides folder.
Addon file excludes KS-12 rifle. This requires Custom Attachment Points and the mod's dependencies. Drop this to your mod_overrides folder.
You only need one or the other. Addon file already includes the smaller suppressor for other guns.
Bootleg file turns the KS-12 suppressor into an integral suppressor for bootleg rifle. Requires Custom Attachment Points