Raycast doesn't hit on mesh every time

Hi !

I have a tiny problem on my multiplayer TPS with the raycast, when i shot, it hit the mesh but i doesn’t fire the damages event every time, so when the player fires on an enemy.
It doesn’t always do the damages so it’s a bit frustrating, does it a regular problem with raycast ? (knowing it used every 0.2 sec) And/or how can i fix it ?

Sorry for my english
Thanks for your help guys and have a nice day !