How to make Hitscan "bullets"

Hey, so, I'm trying to make a procedure that deals damage to an entity if the player is looking at it and left clicks with an item.

I'm basically trying to make a ranged item that doesn't require a projectile. I know I'm complicating myself for nothing, but having exact control of the damage my "gun" is dealing with and also being able to avoid the projectile's delay by using the ray trace procedure will be extremely useful in this case.

however I'm struggling to code this, does any one of you guys know how to make a item of this type?

Thanks!!