To install this mod, please drop the mod folder "HQ HK417" into your mod_overrides, if you don't have one then create one.

mod_overrides localization:
C:\Program Files (x86)\Steam\steamapps\common\PAYDAY 2\assets\ 
or 
C:\Program Files\Steam\steamapps\common\PAYDAY 2\assets\
Depends where your steam client is installed, Enjoy! -Matthelzor

Credits: OVERKILL Software for releasing the model of this weapon on their sketchfab profile. Me for putting it in the game (textures, not model!)
>:3 for fixing the handguard normalmap