Open OpenIV
Replace all file in Grand Theft Auto V\mods\update\x64\dlcpacks\patchday8ng\dlc.rpf\x64\models\cdimages\weapons.rpf\

This will replace the Default Knuckle (Base Model), so if my mod doesn't appear, change it to Default Knuckle first

Backup the original files just in case. I am not resposible for any mistakes during installation. 