It's hard coded into the game, so you won't be able to find it without de-compiling the game I think.
It's easier on Mac, There's and add-on FOLDER that contains all default weapons/maps/decals/vehicles as well as the custom ones.
funnily enough, that won't have it eitherand it's the same setup as on windows, there is an addon folder...
I believe it's in that allGameScripts.cs.dso or whatever it's called in the base's server folder.
So all I have to do is copy that and decompile it somewhere else?
I think you can decompile it with 7-zip.