Models By sito : https://www.gta5-mods.com/users/sito

Model Download Here : https://www.gta5-mods.com/weapons/glock-19-gen-5-with-switch-ets-mag-v2-replace-animated

Retexture By P_GETHIGH

Once you've finished installing the mod, Select the colors and replace in w_pi_appistol and w_pi_appistol_hi folders that you exported.

If you don't already have the w_pi_appistol and w_pi_appistol_hi folders, do the following: Open OpenIV
click Edit Mode, go to Mods > Update > x64 > dlcpacks > patchday8ng > dlc.rpf > x64 > models > cdimages > weapons.rpf
Find or search for w_pi_appistol.ydr, right-click and click Export to OpenFormats (.odr)
Choose the location to export the files, or you can create a new folder, such as g19, export into it and click Selected Folder
Do the same with w_pi_appistol_hi.ydr and navigate to the location of the files you exported
You will have a w_pi_appistol folder and a w_pi_appistol_hi folder, along with w_pi_appistol.odr and w_pi_appistol_hi.odr
Go into the w_pi_appistol folder. Replace the Material_001_normal_spec_2D_View.dds and Material_001_normal_spec_Normal_OpenGL.dds
files from the w_pi_appistol folder within my mod folder and overwrite them. Do the same for the w_pi_appistol_hi folder.
Reopen the program, click edit mode, and navigate to w_pi_appistol.ydr (as before)
Left-click w_pi_appistol.ydr once to select it (a blue highlight will appear)
In the upper left corner, click New, then click Import openFormats. Go to your export location
double-click w_pi_appistol.odr. A "open formats" window will appear; click OK. Wait for the file to load
Then do the same with w_pi_appistol_hi.ydr, Import openFormats file w_pi_appistol_hi.odr and click OK.

And the final step is to double-click w_pi_appistol.ytd, then click blaattt
Look at the top right corner and click replace. Then go to the My Mods folder
into the w_pi_appistol.ytd folder, and double-click blaattt.dds
Do the same with blaattt_normal_spec_Normal_OpenGL. Click to select and press replace
Double-click blaattt_normal_spec_Normal_OpenGL.dds located in the w_pi_appistol.ytd folder within My Mods
Once you've replaced both, look at the bottom right corner and click save
Then do the same with w_pi_appistol+hi.ytd. Double-click it; there will be only one file named DefaultMaterial_2D_View_1. Click replace
Then go to the w_pi_appistol+hi.ytd folder within My Mods, double-click DefaultMaterial_2D_View_1.dds, and press save
Try double-clicking to see what's inside. Check if the textures have changed in w_pi_appistol.ydr or w_pi_appistol_hi.ydr
If it works, try it in the game. Make sure you're using a normal skin.

I might not have explained it very clearly, so I'm going to make a video instead.