place file in 

mods\update\x64\dlcpacks\patchday2ng\dlc.rpf\x64\models\cdimages\weapons.rpf\

mods\update\x64\dlcpacks\patchday3ng\dlc.rpf\x64\models\cdimages\weapons.rpf\

mods\update\x64\dlcpacks\patchday8ng\dlc.rpf\x64\models\cdimages\weapons.rpf\

