This is a zip file that you place in the WoW directory and extract and it changes the gun sound in game to that of a Barrett 50 Caliber Sniper Rifle. It also has clip and bolt sounds included as well. To remove this you just go into the Data folder and delete the Sounds folder and it will reset it. If you have other sound modifications to the game you will have to go deeper down into the sounds>items>weapons and delete.
Updated sound file, previous one was corrupted.