I'm quite new to mapping and want to add some custom weapons to my map. I added a Winter's Howl in which I got lucky with it simply being drag and drop. Now I am trying to add a COD4 pack but I'm getting confused with adding it to _zombiemode_weapons.gsc. I understand the basic template aside from the different "vox" and the number on the end. Any help with what these are / mean is greatly appreciated, thanks in advance.

(This is the COD4 pack https://www.ugx-mods.com/forum/full-weapons/59/cod-4-weapons-for-all/16083/)