The armament weight contains a wide variety of weapons related items as well as protective shielding for the crew. Typical armament items are:
Firing systems
Fire control systems
Bomb bay or missile doors
Armor plating
Weapons ejection systems
Note that the weapons themselves as well as any ammunition are not normally included in this item. Ammunition, bombs, missiles, and most types of external stores are normally counted as part of the payload weight in military aircraft .
It is recommended to use actual data for the armament weight estimation.