Change the name to gunShot2 or something, so it does not overwrite the original gunShot1.
The point is that it
IS supposed to overwrite the origional gun sound, but there is a backup called "backup_gunShot1" if you want to revenrt, just delete the backup_ part and overwrite. This is a mod, it modifies the origional one
. you can name the sound to gunShot1 if you want to...