Medicine25

Replace file to Mods>Update>Update.rpf>dlc_patch>mpapartment>x64>models>cdimages>weapon.rpf

I downloaded a double action revolver mod that makes it look more like a police gun, instead of that ugly AF gold one in the game.
 
Readme tells me to goto update\x64\dlcpacks\mpchristmas2017\dlc.rpf\x64\models\cdimages\weapons.rpf
 
I did, except I use mods folder and just used OpenIV to copy mpchristmas2017 there, and did the replace. OpenIV preview shows the gun has changed, but ingame model is the vanilla.
 
I did add mpchristmas2017 to dlclist.xml
 
I can't even add it as a new DLC as I've done with about hundred cars so far. Nothing I do seems to register with the game. Trainer I use doesn't see it as added weapon, and I can't spawn it.
 
This is the weapon I'm trying to install: https://www.gta5-mods.com/weapons/d-d-p-police-revolver#comments_tab