Is there any method to make a ranged item immune to lightning?

You can create a placeholder item identical to the ranged item and set it to immune to fire. Then, in the procedures of the placeholder, create a procedure for "when item in inventory tick" and do the following steps:

1. Remove 1 placeholder item from the player inventory 
2. Add 1 ranged item to the player inventory

And also, summon the placeholder item before the lightening strikes or whatever you want to do with your mod.

So basically, when the ranged item gets destroyed, it gets changed into the placeholder, and when the player picks up the placeholder, it immediately gets changed back into the ranged item.

I hope this helps, and I'm sorry if this wasn't explained clearly or you do not understand. (I'm not good at explaining stuff lol)