Drone cannon Ex-B

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Gametitle-FO3 MZ
Gametitle-FO3 MZ

The drone cannon Ex-B is a unique weapon added to Fallout 3 by the Mothership Zeta add-on and carried by experimental weapons drones.


The Ex-B (Explosive-bolt) is apparently an alien experiment in equipping the guardian drone model with a cannon that fires energy balls that explode on impact, instead of bouncing around. The Ex-B has a very long range if you manually angle the shot correctly. For example, you can be well outside Evergreen Mills and still hit the trapped super mutant behemoth. The Ex-B can also work underwater.

The drone cannon is an ineffective V.A.T.S. weapon, as the fired projectile will arc towards its target; since the game doesn't compensate for gravity in V.A.T.S., this can leave the projectile several meters away from its intended target.


The drone cannon Ex-B can successfully fire about 417 times from full condition before breaking, the same amount as a normal drone cannon.



Weapon name (current weapon is highlighted)Icon gunDamage per attack (damage per projectile)Icon damageDamage per secondIcon dpsArea of effect damageIcon explosionBonus effectsIcon bonus effectAttacks per secondIcon attackCritical Chance % multiplierIcon chanceCritical damageIcon critical damageAction Point costIcon actionDamage per action pointIcon dapWeapon spreadIcon spreadMagazine capacity (shots per reload)Assault carbine extended magazinesDurability (number of attacks before breaking)Icon repairWeightIcon weightValue in capsIcon merchantValue to weight ratioIcon ratio
Drone cannon fo3mzGametitle-FO3 MZ40
466.7100Timed detonation3.33x150304.70.51417181999111.1
Drone cannon Ex-B fo3mzGametitle-FO3 MZ40
466.7100Impact detonation3.33x150304.70.51417181999111.1


In the Weapons Lab, there is a room where you can spawn brahmin for the drones to kill. Enter the room and kill the drone for the weapon. There is also a second one in the same room that is automatically activated when the first is destroyed.


  • xbox360Icon xbox360 ps3Icon ps3 pcIcon pc When shot, the projectile will occasionally pass through walls or the floor and do nothing.
  • xbox360Icon xbox360 ps3Icon ps3 pcIcon pc In some accounts, when shot the projectile will just disappear as soon as it hits the target, damaging it but not exploding.
  • xbox360Icon xbox360 pcIcon pc When shot into deep water, the projectile will disappear, and then reappear and seemingly "float" in place on the surface without exploding.
  • xbox360Icon xbox360 ps3Icon ps3 pcIcon pc In V.A.T.S. mode, the Ex-B seems to aim like a normal drone cannon, landing short of the enemy as if expecting the projectile to bounce.
  • xbox360Icon xbox360 ps3Icon ps3 The Pip Boy recognizes the Ex-B as an unobtainable (obtainable only through console commands) weapon, evident in its picture (which is also missing).


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