can help? (rapidfire files)

somebody can teach me how to edit Script/Weapon files? or can make it for me?
i tried Spas12 became M3 Super 90 but when i use the weapon, i cant moves. anybody know how to edit? share :3

download WinRAR then look for Blackshot rapid fire files then if you find a file that u want, go and download it then use WinRAR and right click the rapid fire files icon then press extract files