I would not use the weapon script beneath the completed ones. Im not sure if its updated. Go to the script and do these steps:
1) Change name of script (G36C.fpi -> Scar.fpi)
2) Enter the script with Notepad
3) Change the directory of the unable hud (
:state=0:hudreset,hudx=50,hudy=80,hudimagefine=gamecore\huds\Zombie Mod\Weapons\B_G36C.png,hudname=g36csorry,hudhide=1,hudmake=display
:state=0:hudreset,hudx=50,hudy=80,hudimagefine=gamecore\huds\Zombie Mod\Weapons\A_G36C.png,hudname=g36cbuyornot,hudhide=1,hudmake=display
->
:state=0:hudreset,hudx=50,hudy=80,hudimagefine=gamecore\huds\Zombie Mod\Weapons\B_Scar.png,hudname=g36csorry,hudhide=1,hudmake=display
:state=0:hudreset,hudx=50,hudy=80,hudimagefine=gamecore\huds\Zombie Mod\Weapons\A_Scar.png,hudname=g36cbuyornot,hudhide=1,hudmake=display
)
4) Use the search and replace function in notepad to find all of the hudnames and replace them for the sorry hud (g36csorry -> scarsorry)
5) Repeat for the second hud (g36cbuyornot -> scarbuyornot)
That should make the script fine. Those are the steps i used to make my other weapon huds. It saved time using the search and replace because it means that you dont miss any hud names out and be left with problems such as yours.