Custom weapon effect/enchantment - increase headshot damage

[eardstapa]

I am working on a custom weapon mod, and I'd really like to add a custom enchantment or effect that will give a gun increased headshot damage. I want the effect to be tied to a weapon, i.e. not a permanent character perk. However, I don't know if such an effect is even possible. I assume it would require some scripting, but I don't know.

Any advice would be appreciated.