

Mods are assigned effects on the weapon's Mod Info tab. In addition, attached Weapon Mods are effectively destroyed and merged into the weapon itself- they do not run their scripts, and cannot be detected using the GetEquipped function. If the script contains OnAdd blocks, the game will crash when the mod is attached. However, they do not run their OnDrop or OnEquip blocks when they are attached to a weapon. Multiple different weapons can therefore use the same mod and grant different bonuses. Note, Weapon Mods have no effect in and of themselves- the only data they have is text description.

They can be selected as 'mods' on a weapon's Mod Info tab. Weapon mod items, known in the GECK as Item Mods, are new items in Fallout: New Vegas roughly similar in behaviour to Misc items.
