Does anybody know how to change the names of guns when they are pack a punched? 

Any help would be greatly appreciated, thanks.

Does anybody know how to change the names of guns when they are pack a punched?

Any help would be greatly appreciated, thanks.

Open the weapon file with notepad or an weapon editor and change it there.

Now I think about it cod used a translated file for that. Look in root\raw\english\localizedstrings and somewhere there you can find the file. 
This is for waw maybe also the same for bo3?

Thanks, I'll give it a try