>>284998420
>get you gmod files here, such as a HEV freeman or whatever
https://garrysmods.org/

>mdl files are compiled model files (probably for performance reasons), for the mdl decompiling you can use Crowbar:
https://developer.valvesoftware.com/wiki/Crowbar

>vtx files contain textures, and i think you can easily import/export them using: https://developer.valvesoftware.com/wiki/VTFEdit

>The original models are in smd format which you can easily import into blender 2.79 using the official Valve script for the smd format: http://developer.valvesoftware.com/wiki/Blender_Source_Tools