GTA V - Olympia Shotgun vs. the Zombies (Left4Santos Mod)

Wanted to try out this new shotgun model (it replaces the double barreled shotgun). What's best to try it than a zombie invasion?
https://www.gta5-mods.com/weapons/rottweil-olympia-72
https://www.gta5-mods.com/scripts/left4santos