All guns have the same item ID of "tacz_modern_kinetic_gun", Please change it. I can't use luckperms and banitem plugins if all guns have the same item ID to bypass specific guns. It always shows to bypass as "banitem.bypass.world.tacz_modern_kinetic_gun.*" I have a server where everyone can hold a gun, but there is a specific gun that they can't hold.

still not working, banitem plugin are only accept vanilla items for nbt tags, do you have discord?

if the mod or plugin allows you to add nbt tags to the list, you can block them with their respective tag, for example:
tacz:modern_kinetic_gun{GunId:"tacz:ak47"} you can see the id of the gun by typing /data get entity @s SelectedItem when holding certain gun

The plugin does not support nbt. This is probably a plugin problem.

We will not fix this issue.