Replace all the files in patchday3ng folder to
mods/update/x64/dlcpacks/patchday3ng/dlc/x64/models/cdimages/weapons
Replace all the files in patchday4ng folder to
mods/update/x64/dlcpacks/patchday4ng/dlc/x64/models/cdimages/weapons
Note: Eotech and Grip is Stick to the weapon so cant be customise
Credits:
chinweiren213