you have too download the zip. file from https://gamebanana.com/skins/108984

Models

you need too replease the models simply go "steam\steamapps\common\SourceFilmmaker\game\tf\models\weapons\c_models"
from the downloaded zip. file you need to open "models\weapons\c_models
there will be 2 folders that contain the models of it simply copy the c_pistol or ambassador and extract them in c_models just replace them if u want him have the original pistol just delete the model so it can get the original one if it didn't worked extract the files from c_pistol and put them in c_models

Materail

go to SourceFilmmaker\game\tf\materials\models\weapons\c_items
then open the material folder there will be 4 files 1 vtf. 3 vmt Extract them in c_items
about the Texan Rancher folder just extract it in c_items it might be usefull tho about

Sound

About sound, dont mind it its perfect to use the pistol sound from L4D2

Open up SFM, find pistol or ambasador and there you have it

i cant belive nobody said anything in here but i guess that will help ya Cya