How to get my mob to use range item like a bow?(resolve)

Next to the Check to make mod do ranged attacks, there is a box. Click on it and select the item that your mod should shoot.

How could I get it to use something like a bow because when I select the item i want it to throw it doesn't use any of it's effects. How can I make it shoot a ranged projectile that has special effects it does when it hits the ground? Please help this is super important for my mod.

Thanks,

Shadow

I cant find a way to make my mob use a custom gun. Where is the make mob ranged option I dont see it anywhere.

same bro