cheat engine link: http://www.mediafire.com/download/k1b20cfnkflfgcj/Nopde+Engine+7.0.rar
Note gun your changing must be same amount or more amount of letters you are changing it to. (example if you have AWP it only has 3 letters so you cant change it to 8 letter Predator) but if you have Predator you can change it to any weapon that has 8 letters. Spelling MUST be exact CAPS matters.
Software download link: www.cheatengine.org/