BACKUP YOUR ORIGINAL FILES!
Before replacing, make sure to make a backup folder and throw your standard dlc there.
Installation:
1.Open OpenIV,
2. go to update\x64\dlcpacks\patchday8ng\x64/models\cdimages\weapons
update\x64\dlcpacks\mpheist4\dlc\x64\models\cdimages\weapons
update\x64\dlcpacks\mpexecutive\x64\models\cdimages\weapons
update\x64\dlcpacks\mpsum2\x64\models\cdimages\weapons
3.Drag everething from downloaded archive and put it in this folder.
4.Enjoy!.
Credits:
Litrium