I've realized that for level 140 to 200 the only good weapons are Gungnir, Shining Rod and Death eater
Here is a another shotgun based weapon Photon Launcher
Base Model > 
Charged Model >
Special Skills > Press RMB when charged to Summon Photon zone which slowed downs the zombies and resets your ammo also increases damage when zombies are inside the Photon zone
Review Video on Youtube >
Photon Launcher, Available to Level 170, Cost 250000.
Download > https://gamebanana.com/mods/491563
GameBanana is an active and trusted modding community where you can find Mods for various games. Including CSO.
