The zombie_master_sound.zip file you have requested: miscellaneous / Source Mod / Half-Life 2: Zombie Master Weapon Sounds - 1.31mb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:
This is a little modification to the Zombie Master weapons. It has replaced most of the rifle and pistol sounds. The mac10 sounds remain except for the firing sound.