Download and install OpenIV.


Navigate to Grand Theft Auto V\update\x64\dlcpacks\patchday3ng\dlc.rpf\x64\models\cdimages\weapons.rpf and dump the contents of
patchday3ng folder from the zip within the weapons.rpf archive.


Then navigate to Grand Theft Auto V\update\update.rpf\x64\patch\data\cdimages\scaleform_generic.rpf\
and drop in the hud.ytd from the update folder if you want the weapon icon to function properly.

You should now be good to go.