Just search the workshop for TTT weapon viewmodel replacements. Most of those work, some of them don't. All you have to do is look.
The rainbow one works @Qaaap @Rare Endangered Spycrab These two both have csgo skin replacements. I used to use skycrabs so I can vouch that his are okay, however I don't know the quality of qaaaps (not saying they are bad I love you qaaap).
if you have CS textures (the folder in addon folder) >Retexture only (original model ) All Vanilla weapons eg. (M4a1, Mac-10, Shotgun, pistol, glock, deagle nades) >Remodel and retexture (but some of them has no reloading sound because it's Garry's mod) AWP Ak-47 Sig p228 Aug pro-90