Drone Cannon

The  is a weapon of alien origin which is added to Fallout 3 in the Mothership Zeta add-on. It has a unique variant called the Drone Cannon Ex-B.

Characteristics
It is the removed arm cannon of a Guardian Drone. It fires a ball of energy that acts as a grenade, bouncing and then exploding after a period of about 3 seconds. The projectile has the ability to move buses and cars before exploding. This weapon is hard to use at first, but once you understand its operation, it becomes an extremely devastating weapon.

When fired into water, the projectile will continue normally, bouncing off any obstructions under the water. It will explode normally like other explosives.

Obtaining
This gun can be found on Guardian Drones along with Alien Power Modules to power them. The cannons can also be shot off the drones and picked up like other weapons.

Appearances
The appears in the Mothership Zeta add-on for Fallout 3.

Bugs

 * You know when you have the bugged Drone Cannon if you get two cannons form one Guardian Drone(Xbox 360, confirmed)
 * When taking the cannon from a drone, it has no icon (PipOS Error - 26 [File Not Found]) while in the Drone's inventory. However, the Drone Cannon Ex-B does have a picture.
 * While having the bugged Drone Cannon it will be in perfect condition and will do around 140-150 damage while having the same effect of Drone Cannon Ex-B as it explodes on contact.(Xbox 360, unconfirmed)
 * If you wish to keep the bugged Drone Cannon do not try to loot another bugged Drone Cannon while you have one in inventory for both bugged Cannons will become a normal Drone Cannon in around 50% condition. (Xbox 360, unconfirmed)
 * The bugged Drone Cannon will be held like a melee weapon resulting in you holding on to nothing while whole cannon points up, but mysteriously it still fires straight. (Xbox 360, unconfirmed)
 * If you drop the bugged Drone Cannon it will become a normal Drone Cannon (Xbox 360, unconfirmed). However leaving the weapon in a locker seems to preserve the bug(unconfirmed)