Invisible gun


So I recently switched to linux server hosting. I did FastDL etc. So I deleted all of the folders in my “Download” folder in gmod to make sure the FastDL works. Sure enough, I download most mdl files, including m9k auga, famas, etc. Though when firing, it is invisible but I can hear the sound. It does not have the “ERROR” its just invisible, and I checked and I downloaded the .mdl file. Any help?

P.S. MDL files are in models folder and in its own models fodler inside the addon folder.